Reducing disparities in asthma care: priorities for research--National Heart, Lung, and Blood Institute workshop report

A higher Asthma Medication Ratio (AMR) predicts a decrease in ED visits among African American and Hispanic children

INTRODUCTION

Higher rates of ED visits and hospitalizations for asthma among African American and Hispanic children may indicate suboptimal management of asthma, leading to a greater financial burden of healthcare. It is not well known if an association of race/ethnicity with controller medication and hospital-based care utilization exists.

OBJECTIVE

This study examines whether the Asthma Medication Ratio (AMR) predicts healthcare utilization for asthma by race/ethnicity.

METHODS

4,584 Medi-Cal children (Ages 5-11) with persistent asthma in Los Angeles were identified and their AMRs (2018) were calculated based on the HEDIS criteria. Healthcare utilization data were used, including hospitalizations, ED visits, and pharmacy claims to examine whether a higher AMR predicts decreases in healthcare utilization by race/ethnicity in the subsequent 3,6, and 12 months (2019).

RESULTS

The average AMR was lowest among African American children (0.401). In the subsequent 12 months, they were highest in ED visits (0.249) and hospitalizations (0.121), but lowest in outpatient visits (0.793). The results of logistic regression showed that a higher value of AMR (>0.5) contributed to decreases in ED visits in the subsequent 12 months only among African Americans (OR = 0.551, 95% CI 0.364-0.832) and Hispanics (OR = 0.613, 95% CI 0.489-0.770). No association between AMR and hospitalizations was found.

CONCLUSIONS

Our findings indicate that increased use of controller medication contributes to a decrease in ED visits among African American and Hispanic children with persistent asthma. Increased use of controller medications and caregiver's efforts for medication adherence may contribute to a reduction in asthma disparities.

Children with Near-Fatal Asthma: The Use of Inhaled Volatile Anesthetics and Extracorporeal Membrane Oxygenation

Background and Purpose: The use of extracorporeal membrane oxygenation (ECMO) has been described for near-fatal asthma that continues to be refractory despite maximal medical therapy. Methods: Patients admitted to the pediatric intensive care unit at Texas Children's Hospital from 2012 to 2020 with the diagnosis of asthma who were supported on ECMO or isoflurane were included in the study. Patient demographics, medication usage, and complications were compared between the case group (ECMO, n = 12) and the control group (isoflurane only, n = 8). Results: All patients survived to discharge. ECMO patients received shorter durations of albuterol (12 versus 104 h, P = 0.0002) and terbutaline (13.3 versus 31.5 h, P = 0.0250). There were no differences in complication rates between the 2 groups. Conclusion: ECMO is a reasonable and safe support method for patients with near-fatal asthma and may lead to less bronchodilator medication exposure when compared with inhaled volatile anesthetic use.

Heart Rate Variability Biofeedback Does Not Substitute for Asthma Steroid Controller Medication

Despite previous findings of therapeutic effects for heart rate variability biofeedback (HRVB) on asthma, it is not known whether HRVB can substitute either for controller or rescue medication, or whether it affects airway inflammation. Sixty-eight paid volunteer steroid naïve study participants with mild or moderate asthma were given 3 months of HRVB or a comparison condition consisting of EEG alpha biofeedback with relaxing music and relaxed paced breathing (EEG+), in a two-center trial. All participants received a month of intensive asthma education prior to randomization. Both treatment conditions produced similar significant improvements on the methacholine challenge test (MCT), asthma symptoms, and asthma quality of life (AQOL). MCT effects were of similar size to those of enhanced placebo procedures reported elsewhere, and were 65% of those of a course of a high-potency inhaled steroid budesonide given to a sub-group of participants following biofeedback training. Exhaled nitric oxide decreased significantly only in the HRVB group, 81% of the budesonide effect, but with no significant differences between groups. Participants reported becoming more relaxed during practice of both techniques. Administration of albuterol after biofeedback sessions produced a large improvement in pulmonary function test results, indicating that neither treatment normalized pulmonary function as a potent controller medication would have done. Impulse oscillometry showed increased upper airway (vocal cord) resistance during biofeedback periods in both groups. These data suggest that HRVB should not be considered an alternative to asthma controller medications (e.g., inhaled steroids), although both biofeedback conditions produced some beneficial effects, warranting further research, and suggesting potential complementary effects. Various hypotheses are presented to explain why HRVB effects on asthma appeared smaller in this study than in earlier studies. Clinical Trial Registration NCT02766374.

Asthma Disparity Photovoice: The Discourses of Black Adolescent and Public Health Policymakers

BACKGROUND

Policies in U.S. public schools that address asthma management for Black adolescents may not sufficiently transform sociocultural determinants of disparities. A critical analysis of public health policy maker and adolescent discourses on asthma management using an ecological framework could inform policy development. This study describes the discourses of asthma management disparities of school and other public health policymakers and Black adolescents with asthma during a statewide asthma planning activity.

METHOD

I conducted a qualitative critical discourse analysis on transcripts and phototexts from a photovoice project with Black adolescents with asthma (n = 19), an asthma-planning meeting with school and public health policymakers (n = 12), and an observation of a photovoice dissemination event that included the same adolescents and policymakers.

RESULTS

Policymakers did not discuss sociocultural discourses concerning asthma management disparities such as racism and discrimination, but the adolescents did. The only shared discourses between adolescents and policymakers were on the management of indoor environments, health care quality, inadequate housing, and outdoor air pollution.

CONCLUSIONS

Including Black adolescents in policymaking activities concerning asthma management disparities furthers the identification of differing and shared discourses. School policies should include multilevel strategies that address structural inequities. Photovoice presents an opportunity for including the voice of marginalized youth in policy-planning processes.

The importance of atopy on exhaled nitric oxide levels in African American children

BACKGROUND

For physicians to be maximally effective in managing asthma in minority populations, a better understanding of the factors that affect fractional exhaled nitric oxide (FeNO) measurements in African Americans is needed.

OBJECTIVE

To examine demographic, environmental, and physiologic factors that influence FeNO measurements in African American children with and without asthma.

METHODS

A cross-sectional study of 128 African American children aged 7 to 18 years (44% with asthma) was conducted. FeNO measurements, skin prick tests (as a measure of atopy), spirometry, and questionnaire data were obtained from all participants. Regression models were constructed after identifying factors significantly associated on univariate analysis.

RESULTS

Among all study participants, the mean FeNO measurement at baseline was 24.4 ppb. Children with asthma had a higher level than those without (30.9 vs 19.3 ppb, P = .002). When examining all children through logistic regression analysis, an elevated FeNO level was significantly associated with atopy, lower spirometric values, and current asthma (P < .05 for all). Among asthmatic children, univariate analysis revealed that an elevated FeNO level was associated with inhaled corticosteroid use, recent respiratory infection, and atopy (P < .05 for all). However, only atopy remained significant after regression analysis. For asthmatic and nonasthmatic children, FeNO levels were directly correlated with the number of positive skin test results.

CONCLUSION

In African American children with and without asthma, FeNO levels are strongly influenced by atopy. Guidelines for FeNO measurements that incorporate atopic status are needed.

Risk factors associated with hospital readmission in pediatric asthma

Asthma is a leading cause of hospitalization among children, and about 15-50% of pediatric patients are readmitted after an index admission. The purpose of this integrative review is to explore contemporary scientific findings on the association between pediatric asthma readmission and various demographic, environmental, psychosocial and clinical risk factors. An electronic database search resulted in a sample of 29 studies. African American, public or no insurers, previous admission and complex chronic comorbidity were identified as risk factors associated with pediatric asthma readmission. However, more interdisciplinary and well-designed investigations are warranted to further explicate the spectrum of environmental and psychosocial correlates.

Persistent differences in asthma self-efficacy by race, ethnicity, and income in adults with asthma

OBJECTIVE

The objective of this population-based study was to determine if and to what extent there are differences in asthma self-efficacy by race/ethnicity and income, and whether health status, levels of acculturation, and health care factors may explain these differences.

METHODS

We conducted a secondary data analysis of asthma self-efficacy using the 2009 and 2011-2012 California Health Interview Survey, in adults with asthma (n=7874). In order to examine if and how the effect of race/ethnicity and income on asthma self-efficacy may have been altered by health status, acculturation, and health care factors, we used staged multivariable logistic regression models. We conducted mediation analyses to evaluate which of these factors might mediate disparities in self-efficacy by race/ethnicity and income.

RESULTS

69.8% of adults reported having high asthma self-efficacy. Latinos (OR 0.66; 95% CI 0.51-0.86), African-Americans (OR 0.50; 95% CI 0.29-0.83), American Indian/Alaskan Natives (OR 0.55; 95% CI 0.31-0.98) and Asian/Pacific Islanders (OR 0.34; 95% CI 0.23-0.52) were less likely to report high self-efficacy compared to Whites. Individuals with income below the federal poverty level (OR 0.56; 95% CI 0.40-0.78) were less likely to report high self-efficacy compared to higher income individuals. The relationship between income and self-efficacy was no longer significant after further adjustment for health care factors; however, the differences in race and ethnicity persisted. Receiving an asthma management plan mediated the relationship in certain subgroups.

CONCLUSIONS

Addressing modifiable health care factors may play an important role in reducing disparities in asthma self-efficacy.

The influence of community violence and protective factors on asthma morbidity and healthcare utilization in high-risk children

We examined the longitudinal effects of community risk and protective factors on asthma morbidity and healthcare utilization. Three hundred urban caregivers of children with poorly controlled asthma were enrolled in a randomized controlled trial testing the effectiveness of a behavioral/educational intervention and completed measures of exposure to community violence (ECV), social cohesion (SC), informal social control (ISC), child asthma control, child asthma symptom days/nights, and healthcare utilization. Latent growth curve modeling examined the direct and interaction effects of ECV, SC, and ISC on the asthma outcomes over 12 months. Caregivers were primarily the biological mother (92 %), single (70 %), and poor (50 % earned less than $10,000). Children were African American (96 %) and young (mean age = 5.5 years, SD = 2.2). ECV at baseline was high, with 24.7 % of caregivers reporting more than two exposures to violence in the previous 6 months (M = 1.45, SD = 1.61). Caregiver ECV-predicted asthma-related healthcare utilization at baseline (b = 0.19, SE = 0.07, p = 0.003) and 2 months (b = 0.12, s.e. = 0.05, p = 0.04). ISC and SC moderated the effect of ECV on healthcare utilization. Our findings suggest that multifaceted interventions that include strategies to curb violence and foster feelings of cohesion among low-income urban residents may be needed to reduce asthma-related emergency services.

Disparities in Asthma Care, Management, and Education Among Children With Asthma

Health disparities are pervasive in the United States. Health and health care disparities are the differences or gaps in health (eg, life expectancy, morbidity, risk factors, and quality of life) and health care access and quality between segments of the United States population as related to race/ethnicity and socioeconomic status (eg, income, education). Multiple factors are associated with such disparities in asthma management and education. This article explores some of those factors and summarizes the strategies developed and interventions implemented to address disparities associated with asthma care and education among racial and ethnic minority children. It also discusses the need for further research to identify effective asthma education approaches for improving the management of asthma among racial and ethnic minority children. More exploration of the root causes of health care disparities, including policy studies in the area of social determinates of health and health equity, is also needed.

Challenges in providing preventive care to inner-city children with asthma

Although the scientific understanding of the pathophysiology of asthma and the quality of asthma therapies have significantly improved over the past 30 years, asthma morbidity remains high and preventive care low for inner-city children. This article focuses on 4 major challenges to providing preventive care (family and patient attitudes and beliefs, lack of access to quality medical care, psychosocial factors, environmental factors) based on prior evidence and the authors' observation of these challenges in research with inner-city children with asthma over the past decade. Cost issues related to preventive care are addressed, and recommendations provide for pediatric nurses.

Spatial Cluster Detection for Longitudinal Outcomes using Administrative Regions

This manuscript proposes a new spatial cluster detection method for longitudinal outcomes that detects neighborhoods and regions with elevated rates of disease while controlling for individual level confounders. The proposed method, CumResPerm, utilizes cumulative geographic residuals through a permutation test to detect potential clusters which are are defined as sets of administrative regions, such as a town, or group of administrative regions. Previous cluster detection methods are not able to incorporate individual level data including covariate adjustment, while still being able to define potential clusters using informative neighborhood or town boundaries. Often it is of interest to detect such spatial clusters because individuals residing in a town may have similar environmental exposures or socioeconomic backgrounds due to administrative reasons, such as zoning laws. Therefore these boundaries can be very informative and more relevant than arbitrary clusters such as the standard circle or square. Application of the CumResPerm method will be illustrated by the Home Allergens and Asthma prospective cohort study analyzing the relationship between area or neighborhood residence and repeated measured outcome, occurrence of wheeze in the last 6 months, while taking into account mobile locations.

Complementary and alternative medicine use and psychosocial outcomes among urban adolescents with asthma

Objective. Many adolescents with asthma use complementary and alternative medicine (CAM) for asthma symptom management. The purpose of this study was to investigate cross-sectional and longitudinal differences in psychosocial health outcomes between high and low CAM users among urban adolescents with asthma. Methods. Adolescents (Time 1: N = 151, Time 2: N = 131) completed self-report measures regarding the use of 10 CAM modalities, mental health, and health-related quality of life (HRQoL) following two clinic visits 1 year apart as part of a larger observational study. Multivariable regression analyses using backward elimination examined relationships between CAM use at Time 1 and outcomes at Time 1 and Time 2, controlling for key covariates and, in longitudinal analyses, Time 1 functioning. Results. Participants (M(age) = 15.8, SD = 1.85) were primarily African-American (n = 129 [85%]) and female (n = 91 [60%]) adolescents with asthma. High and low CAM users differed significantly in terms of several psychosocial health outcomes, both cross-sectionally and longitudinally. In cross-sectional multivariable analyses, greater frequency of praying was associated with better psychosocial HRQoL (R(2) = 0.22). No longitudinal relationships remained significant in multivariable analyses. Conclusions. Specific CAM techniques are differentially associated with psychosocial outcomes, indicating the importance of examining CAM modalities individually. Greater frequency of praying was cross-sectionally associated with better psychosocial HRQoL. When controlling for key covariates, CAM use was not associated with psychosocial outcomes over time. Further research should examine the effects of CAM use in controlled research settings.

Associations between genetic variants in vitamin D metabolism and asthma characteristics in young African Americans: a pilot study

INTRODUCTION

Low vitamin D levels have been associated with asthma severity in children. Young, urban African Americans (AAs) have high rates of hypovitaminosis D and asthma. Our objective was to determine associations between variants in vitamin D metabolism genes and asthma characteristics in a pilot study of young urban AAs.

MATERIALS AND METHODS

Two urban AA cohorts of subjects aged 6 to 20 years (139 subjects with asthma and 74 subjects without asthma) were genotyped for 12 single nucleotide polymorphisms (SNPs) in 3 vitamin D metabolism genes: VDR (vitamin D receptor), CYP24A1 (cytochrome P450 vitamin D 24-hydroxylase), and CYP2R1 (cytochrome P450 vitamin D 25-hydroxylase). In a case-control analysis, SNPs were studied for associations with an asthma diagnosis. Within the asthmatic cohort, SNPs were analyzed for associations with quantitative asthma characteristics. All analyses were adjusted for age, sex, and body mass index percentile.

RESULTS

Only the CYP2R1 SNP rs10766197 homozygous minor genotype was associated with asthma (P = 0.044). CYP24A1 SNP rs2248137 was associated with lower vitamin D levels (P = 0.006). Within the asthma cohort, multiple significant associations between SNPs and asthma characteristics were identified; VDR SNP rs2228570 was associated with the higher nighttime asthma morbidity scores (P = 0.04), lower baseline spirometric measures (P < 0.05), 1 or more positive aeroallergen skin test (P = 0.003), and increased immunoglobulin E levels (P < 0.001).

DISCUSSION

This pilot study demonstrates that variants in vitamin D metabolism genes are associated with quantitative asthma characteristics in young, urban AAs. The collection of these associations provides evidence for the need for a large population-based study of vitamin D-relevant SNPs in this cohort.

Pregnancy related treatment disparities of acute asthma exacerbations in the emergency department

OBJECTIVE

Asthma is one of the most common medical conditions complicating pregnancy. Despite the presence of published guidelines outlining the care of the pregnant patient with asthma, disparities in the treatment of acute asthma exacerbations in the emergency department related to pregnancy status are known to exist. We sought to determine if pregnancy status affected the treatment of women presenting to a tertiary emergency department for care of acute asthma exacerbations.

METHODS

We retrospectively compared the emergency department treatment of acute asthma exacerbations in 123 pregnant women to 123 non-pregnant controls. Asthma exacerbations were classified by severity according to pre-determined criteria.

RESULTS

In the emergency department (ED), pregnant women were significantly less likely to be treated with systemic corticosteroids than non-pregnant controls (50.8% versus 72.4%, p = 0.001). Similarly, 41% of pregnant women received prescriptions for prednisone at the time of discharge from the ED compared to 69.2% of non-pregnant women (p < 0.001).

CONCLUSIONS

In this population of asthmatics presenting to a tertiary emergency department with acute asthma exacerbations, pregnant women were less likely to receive appropriate therapy with systemic corticosteroids.

Complementary and alternative medicine behaviors and beliefs in urban adolescents with asthma

BACKGROUND/PURPOSE

Up to 80% of adolescents with asthma have used complementary and alternative medicine (CAM) for symptom management. However, little is known about patient characteristics associated with CAM factors other than use. Previous studies recommend provider-patient discussion of CAM use, although few adolescents with asthma disclose their CAM use to their providers. To inform clinical interactions, this study examined prevalence and predictors of CAM use, consideration of use, disclosure of use, and perceived efficacy of use, in urban adolescents with asthma.

METHODS

Adolescents with asthma (N = 151) recruited from a children's hospital completed questionnaires addressing demographic and clinical variables and 10 CAM modalities. Response frequencies to four questions assessing CAM use, consideration of use, disclosure, and perceived efficacy were calculated for each modality. Multivariable logistic regression analyses examined characteristics associated with responses to each question for the two most commonly used CAM modalities.

RESULTS

Participants' mean age was 15.8 (SD = 1.8), 60% were female and 85% were African-American. Seventy-one percent reported using CAM for symptom management in the past month. Relaxation (64%) and prayer (61%) were the most frequently reported modalities and were perceived to be the most efficacious. Adolescents most commonly reported considering using relaxation (85%) and prayer (80%) for future symptom management. Participants were most likely to disclose their use of yoga (59%) and diet (57%), and least likely to disclose prayer (33%) and guided imagery (36%) to providers. In multivariable analyses, older adolescents (OR = 1.27, p < .05) and African-Americans (OR = 2.76, p < .05) were more likely to use relaxation. Adolescents with more frequent asthma symptoms (OR = 0.98, p < .05) were more likely to use prayer. African-Americans were more likely to report using prayer (OR = 3.47, p < .05) and consider using prayer (OR = 7.98, p < .01) in the future for symptom management.

CONCLUSIONS

Many urban adolescents used and would consider using CAM, specifically relaxation and prayer, for asthma symptom management. African-Americans, older adolescents, and those with more frequent symptoms were more likely to use and/or consider using CAM. Providers caring for urban adolescents with asthma should discuss CAM with patients, particularly those identified as likely to use CAM. Future studies should examine relationships between CAM use and health outcomes.

A simulation model approach to analysis of the business case for eliminating health care disparities

BACKGROUND

Purchasers can play an important role in eliminating racial and ethnic disparities in health care. A need exists to develop a compelling "business case" from the employer perspective to put, and keep, the issue of racial/ethnic disparities in health care on the quality improvement agenda for health plans and providers.

METHODS

To illustrate a method for calculating an employer business case for disparity reduction and to compare the business case in two clinical areas, we conducted analyses of the direct (medical care costs paid by employers) and indirect (absenteeism, productivity) effects of eliminating known racial/ethnic disparities in mammography screening and appropriate medication use for patients with asthma. We used Markov simulation models to estimate the consequences, for defined populations of African-American employees or health plan members, of a 10% increase in HEDIS mammography rates or a 10% increase in appropriate medication use among either adults or children/adolescents with asthma.

RESULTS

The savings per employed African-American woman aged 50-65 associated with a 10% increase in HEDIS mammography rate, from direct medical expenses and indirect costs (absenteeism, productivity) combined, was $50. The findings for asthma were more favorable from an employer point of view at approximately $1,660 per person if raising medication adherence rates in African-American employees or dependents by 10%.

CONCLUSIONS

For the employer business case, both clinical scenarios modeled showed positive results. There is a greater potential financial gain related to eliminating a disparity in asthma medications than there is for eliminating a disparity in mammography rates.

The Role of Parents' Medication Beliefs, Religious Problem-Solving, and Risks for Treatment Nonadherence in Urban Families with Asthma

Childhood asthma is highly prevalent, affecting approximately nine million children in the United States. Negative effects of pediatric asthma are disproportionately experienced by ethnic minorities living in low-income, urban settings. Given the great diversity in families' ways of addressing children's asthma symptoms, sociocultural factors underlying asthma disparities must be examined. The current study investigated associations among parents' beliefs about conventional and holistic/alternative medications, parents' religious problem-solving strategies and childrens' risks for asthma treatment nonadherence. The sample included 66 parents of ethnically diverse children with asthma living in urban settings. Factor analysis of the Religious Problem Solving Questionnaire yielded two factors, self-directed (ie, solving problems independently of God) and God-involved problem solving. Parents' strong positive beliefs about conventional and alternative medications were associated with greater self-directed problem solving and with more risks for nonadherence. Higher levels of self-directed problem solving also were associated with more risks for nonadherence. Self-directed problem solving mediated the associations of conventional and alternative medication beliefs with risks for nonadherence. Possible explanations for these findings are discussed.

Perspectives on complementary and alternative therapies in asthma

Asthma is a chronic disease that affects millions of individuals living in the USA. Proper asthma management is essential for controlling asthma symptoms and exacerbations. In recent years, however, there has been increased recognition of individuals using complementary and alternative medicine (CAM) to treat asthma. This article reviews the status of the current literature on various cultural factors that influence CAM use. In addition, current research of two widely used forms of CAM, herbal remedies and relaxation techniques, is presented. Future directions and recommendations to increase the methodological rigor of CAM research are discussed, particularly as they pertain to herbal remedies and relaxation strategies. The importance of well-designed research studies, including observational studies and randomized controlled trials, is highlighted.

Regional and racial disparities in asthma hospitalizations in Mississippi

BACKGROUND

In the United States, asthma hospitalization rates are disproportionately high among blacks compared with other racial/ethnic groups and vary by geographic region. These disparities among asthma hospitalizations might be affected by social, environmental, and health-care access factors.

OBJECTIVE

To determine demographic risk factors for asthma hospitalizations in urban versus rural areas of Mississippi.

METHODS

A cross-sectional study using data from the Mississippi Asthma Surveillance System was conducted to compare asthma hospitalizations in the urban Jackson metropolitan statistical area and rural Delta regions of Mississippi from 2003 to 2005. Factors including race, sex, age, and household income that might be associated with multiple hospitalizations for asthma (3 or more during the study period) were assessed using logistic regression.

RESULTS

Asthma hospitalization rates were significantly higher among all demographic groups in the rural Delta region compared with the urban Jackson Metropolitan Statistical Area (P < .001). In both regions, hospitalization rates were higher among blacks and females (P < .001). Asthma hospitalization rates were highest among children (0-17 years) and older adults (>or=65 years). In both regions, blacks were more likely to have 3 or more asthma hospitalizations (P < .001). Residents of the Delta had higher odds for multiple hospitalizations controlling for race, sex, age, and household income (P < .05).

CONCLUSION

Blacks with asthma are more likely to have multiple asthma hospitalizations in Mississippi. Higher odds of multiple asthma discharges for Delta residents were not explained by race, sex, age, or income, indicating that other contributing factors (eg, environmental, social, and access to care factors) need further investigation.

Spatial cluster detection for repeatedly measured outcomes while accounting for residential history

Spatial cluster detection has become an important methodology in quantifying the effect of hazardous exposures. Previous methods have focused on cross-sectional outcomes that are binary or continuous. There are virtually no spatial cluster detection methods proposed for longitudinal outcomes. This paper proposes a new spatial cluster detection method for repeated outcomes using cumulative geographic residuals. A major advantage of this method is its ability to readily incorporate information on study participants relocation, which most cluster detection statistics cannot. Application of these methods will be illustrated by the Home Allergens and Asthma prospective cohort study analyzing the relationship between environmental exposures and repeated measured outcome, occurrence of wheeze in the last 6 months, while taking into account mobile locations.

Assessing the validity of self-reported medication adherence among inner-city asthmatic adults: the Medication Adherence Report Scale for Asthma

BACKGROUND

A validated tool to assess adherence with inhaled corticosteroids (ICS) could help physicians and researchers determine whether poor asthma control is due to poor adherence or severe intrinsic asthma.

OBJECTIVE

To assess the performance of the Medication Adherence Report Scale for Asthma (MARS-A), a 10-item, self-reported measure of adherence with ICS.

METHODS

We interviewed 318 asthmatic adults receiving care at 2 inner-city clinics. Self-reported adherence with ICS was measured by MARS-A at baseline and 1 and 3 months. ICS adherence was measured electronically in 53 patients. Electronic adherence was the percentage of days patients used ICS. Patients with a mean MARS-A score of 4.5 or higher or with electronic adherence of more than 70% were defined as good adherers. We assessed internal validity (Cronbach alpha, test-retest correlations), criterion validity (associations between self-reported adherence and electronic adherence), and construct validity (correlating self-reported adherence with ICS beliefs).

RESULTS

The mean patient age was 47 years; 40% of patients were Hispanic, 40% were black, and 18% were white; 53% had prior asthma hospitalizations; and 70% had prior oral steroid use. Electronic substudy patients were similar to the rest of the cohort in age, sex, race, and asthma severity. MARS-A had good interitem correlation in English and Spanish (Cronbach alpha = 0.85 and 0.86, respectively) and good test-retest reliability (r = 0.65, P < .001). According to electronic measurements, patients used ICS 52% of days. Continuous MARS-A scores correlated with continuous electronic adherence (r = 0.42, P<.001), and dichotomized high self-reported adherence predicted high electronic adherence (odds ratio, 10.6; 95% confidence interval, 2.5-44.5; P < .001). Construct validity was good, with self-reported adherence higher in those saying daily ICS use was important and ICS were controller medications (P = .04).

CONCLUSIONS

MARS-A demonstrated good psychometric performance as a self-reported measure of adherence with ICS among English- and Spanish-speaking, low-income, minority patients with asthma.

Recent innovations to improve asthma outcomes in vulnerable children

PURPOSE OF REVIEW

Despite overall improvements in asthma care through an increasing evidence base, disparities in outcomes of children of ethnic minorities and low socioeconomic status are well documented across healthcare systems. New interventions to reduce gaps in outcomes among these children are continually being evaluated. This article reviews the most relevant and influential recent studies.

RECENT FINDINGS

A number of interventions aimed at vulnerable children with asthma have been successful. Most of these include a component of education and self-management. There is some evidence that culturally competent care produces improved outcomes, whereas stronger evidence exists for multifaceted programs and community health workers providing home visits for education and environmental allergen reduction. Targeting children and families through school-based programs may be an effective outreach strategy. Use of novel technologies such as educational messages on MP3 players shows promise in reaching at-risk adolescents.

SUMMARY

There are promising strategies proven to significantly decrease disparities in asthma among vulnerable children. Further research must be performed to elucidate the interventions that produce the greatest impact on asthma-related outcomes while being feasible, sustainable, and cost-effective.

Impact of positive and negative beliefs about inhaled corticosteroids on adherence in inner-city asthmatic patients

BACKGROUND

Daily inhaled corticosteroid (ICS) use is the cornerstone of asthma management, although it is often suboptimal, especially in inner-city populations.

OBJECTIVE

To assess the impact of potentially modifiable medication beliefs on adherence with ICS therapy across time.

METHODS

Asthma history, medication beliefs, and ICS therapy adherence were determined in a prospective, observational cohort. Medication beliefs were based on self-regulation and self-efficacy theory. Self-reported adherence with ICS therapy was assessed using the Medication Adherence Reporting Scale, a validated 10-item instrument, at baseline and at 1 and 3 months. Repeated-measures multivariable regression identified beliefs independently associated with adherence across time after adjusting for age, sex, race, and asthma severity.

RESULTS

The 261 patients were low-income minorities with high rates of asthma hospitalization, emergency department visits, intubation, and oral corticosteroid use. Adherence with ICS therapy was stable across time, with 70% of patients saying that they used ICS all or most of the time when asymptomatic. Most patients (82%) thought it was important to use ICS when asymptomatic, although 49% worried about side effects and 37% worried about becoming addicted. Although 82% felt confident in using ICS, 7% felt that their regimen was hard to follow. In multivariable analyses, the odds of adherence increased for those who felt that using ICS when asymptomatic was important (odds ratio [OR], 4.15) and for those who were confident in using ICS (OR, 2.23) and decreased by worries about side effects (OR, 0.52) or feeling the regimen was hard to follow (OR, 0.48).

CONCLUSIONS

Several positive and negative beliefs about ICS were associated with adherence. Eliciting and addressing these potentially modifiable beliefs may help improve adherence and outcomes.

Detection of undiagnosed and poorly controlled asthma in a hospital-based outpatient pediatric primary care clinic using a health risk assessment system

OBJECTIVE

To determine the rate of undiagnosed and poorly controlled asthma detected by a computerized health risk assessment (HRA) survey system in an urban pediatric hospital-based outpatient teaching clinic.

METHODS

A software-based HRA system uses survey answer patterns to identify children with (1) probable, (2) uncontrolled, and (3) moderate to severe asthma. Parents of patients > or = 2 years of age were asked by clinic staff to complete the touch screen computer survey before seeing their physician from August 2005 through July 2006.

RESULTS

The HRA survey predicted 26% (282/1,098) to have probable asthma. Of these, 51% (144/282) were controlled and the parents reported a previous diagnosis of asthma; 14% (40/282) were controlled and the parents did not report a previous diagnosis of asthma; 25% (71/282) were uncontrolled and the parents reported a previous diagnosis of asthma; and 10% (27/282) were uncontrolled and no previous diagnosis of asthma was reported by the parents. Among active cases completing the baseline version survey (N = 217), 68% reported emergency department (ED) visits / hospitalizations in the last 2 years (44% > or =2), while 59% reported missed school days during the previous year (23% > or =5 days). Impairment, as defined by the 2007 National Heart, Lung, and Blood Institute/National Asthma Education and Prevention Program (NHLBI/NAEPP) asthma guidelines, tended to be higher in patients without a previous diagnosis of asthma, per parental report, but this trend only achieved significance in two measures: daytime symptoms > or =2 days per week in the last 4 weeks (p = 0.028) and more than 5 missed school days in the past year (p = 0.001).

CONCLUSION

A previously validated HRA system can consistently identify a high rate of undiagnosed and poorly controlled asthma in an urban pediatric hospital-based teaching clinic. The utility of such a system would be to reduce missed opportunities for delivery of care and morbidity for the patients who currently have undiagnosed and/or uncontrolled asthma in the pediatric primary care outpatient setting.

Asthma disparities in urban environments

Asthma continues to disproportionately affect minority and low-income groups, with African American and Latino children who live in low-socioeconomic-status urban environments experiencing higher asthma morbidity and mortality than white children. This uneven burden in asthma morbidity has been ever increasing despite medical advancement. Many factors have contributed to these disparities in the areas of health care inequities, which result in inadequate treatment; poor housing, which leads to increased exposure to asthma allergens; and social and psychosocial stressors, which are often unappreciated. Interventions to reduce individual areas of disparities have had varying successes. Because asthma is a complex disease that affects millions of persons, multifaceted comprehensive interventions that combine all evidence-based successful strategies are essential to finally closing the gap in asthma morbidity.

Transdisciplinary research strategies for understanding socially patterned disease: the Asthma Coalition on Community, Environment, and Social Stress (ACCESS) project as a case study

As we have seen a global increase in asthma in the past three decades it has also become clear that it is a socially patterned disease, based on demographic and socioeconomic indicators clustered by areas of residence. This trend is not readily explained by traditional genetic paradigms or physical environmental exposures when considered alone. This has led to consideration of the interplay among physical and psychosocial environmental hazards and the molecular and genetic determinants of risk (i.e., biomedical framing) within the broader socioenvironmental context including socioeconomic position as an upstream "cause of the causes" (i.e., ecological framing). Transdisciplinary research strategies or programs that embrace this complexity through a shared conceptual framework that integrates diverse discipline-specific theories, models, measures, and analytical methods into ongoing asthma research may contribute most significantly toward furthering our understanding of socially patterned disease. This paper provides an overview of a multilevel, multimethod longitudinal study, the Asthma Coalition on Community, Environment and Social Stress (ACCESS), as a case study to exemplify both the opportunities and challenges of transdisciplinary research on urban asthma expression in the United States.

Hospital readmissions for childhood asthma: the role of individual and neighborhood factors

OBJECTIVES

This study used a Cox proportional hazards model to determine whether neighborhood characteristics are associated with risk of readmission for childhood asthma independently of individual characteristics.

METHODS

Rhode Island Hospital Discharge Data from 2001 to 2005 were used to identify children younger than 19 years of age at the time of the index (i.e., first) asthma admission, defined as a primary diagnosis of asthma or a primary diagnosis of respiratory illness with a secondary or tertiary diagnosis of asthma (n=2,919). Hazard ratios of repeat hospitalizations for childhood asthma from 2001 to 2005 were estimated, controlling for individual- and neighborhood-level variables.

RESULTS

During the study period, 15% of the sample was readmitted for asthma (n=451). In the unadjusted cumulative hazard curves, children residing in the census tracts with the highest proportion of crowded housing conditions, racial minority residents, or neighborhood-level poverty had higher cumulative hospital readmission rates as compared with children who resided in less disadvantaged neighborhoods. In the fully adjusted models, children insured by Medicaid at the time of their index admission had readmission rates that were 33% higher than children who were privately insured.

CONCLUSION

Our findings suggest that differences in health-care coverage are associated with higher readmission rates for pediatric asthma, but the relationship between neighborhood inequality and repeat hospitalizations for pediatric asthma requires further exploration. Social indicators such as minority race, Medicaid health insurance, and neighborhood markers of economic disadvantage are tightly interwoven in the U.S. and teasing these relationships apart is important in asthma disparities research.

A new focus on assessing and treating asthma control in the African-American community: a call to action

Asthma continues to be a highly prevalent disease characterized by significant morbidity, unnecessary mortality, and substantial cost to the health care system. After decades of increasing prevalence, the number of current asthmatics in recent years has plateaued at approximately 22 million people in the United States. An additional 10 million Americans have a past history of asthma that is not active. The burden of asthma is higher among African Americans than in any other racial or ethnic group in America. The African-American community continues to experience a disproportional increase in asthma prevalence, morbidity, and mortality. The educational initiatives stemming from the newly revised National Heart Lung and Blood Institute (NHLBI) guidelines provide the opportunity to address the increased burden of asthma in the African American community. These new guidelines, released in August 2007, focus on asthma control as the primary goal of therapy, routine monitoring of asthma control, and use of asthma control assessments to direct treatment. The present review discusses the following: I. The impact of health disparities on outcomes of African Americans with asthma, II. The barriers that prevent asthmatic patients from achieving optimal control, III. The unique factors that challenge practitioners and patients in achieving optimal asthma control in the African American Community, IV. The impact of good asthma control and the need for patients and clinicians to assess asthma control in with a standardized assessment tool, and V. Strategic initiatives and the role of the End The Attacks NOW program in improving outcomes for African American patients with asthma.

Racial disparities in asthma-related health outcomes in severe or difficult-to-treat asthma

BACKGROUND

The underlying reasons for racial disparities in asthma morbidity are not well understood. Multivariate epidemiologic studies evaluating the presence and extent of racial differences in a large cohort of adults with severe or difficult-to-treat asthma are lacking.

OBJECTIVE

To analyze an extensive array of clinical and patient-reported outcomes, using multivariate analysis with a sequential approach, to explain racial differences in asthma-related outcomes in one of the largest cohorts of difficult-to-treat asthmatic patients.

METHODS

Black and white patients (> or = 18-years-old at baseline) were included (n = 2,128). Differences between the 2 racial groups were assessed using several outcome measures at month 12. Assessments were adjusted for confounding variables using a sequence of statistical models.

RESULTS

Most patients were white (88.6%). Blacks were slightly younger, less educated, and more likely to live in urban areas than whites. Blacks were more likely to have severe asthma and to be treated with 3 or more long-term controllers. Poorer quality of life, more asthma control problems, and higher risk of emergency department visits were observed in blacks compared with whites; differences were not explained by adjustment for broad sets of confounding variables. Differences in asthma-related health outcomes remained statistically significant after adjusting for asthma severity.

CONCLUSIONS

Asthma is a serious health problem in blacks and is not explained by differences in demographics, severity, or other health conditions.

Risk factors for death in adults with severe asthma

BACKGROUND

Mortality risk in adult asthma is poorly understood, especially the interplay among race, disease severity, and health care access.

OBJECTIVE

To examine mortality risk factors in adult asthma.

METHODS

In a prospective cohort study of 865 adults with severe asthma in a closed-panel managed care organization, we used structured interviews to evaluate baseline sociodemographics, asthma history, and health status. Patients were followed up until death or the end of the study (mean, 2 years). We used Cox proportional hazards regression to evaluate the impact of sociodemographics, cigarette smoking, and validated measures of perceived asthma control, physical health status, and severity of asthma on the risk of death.

RESULTS

We confirmed 123 deaths (mortality rate, 6.7 per 100 person-years). In an analysis adjusted for sociodemographics and tobacco history, higher severity-of-asthma scores (hazard ratio [HR], 1.11 per 0.5-SD increase in severity-of-asthma score; 95% confidence interval [CI], 1.01-1.23) and lower perceived asthma control scores (HR, 0.91 per 0.5-SD increase in perceived asthma control score; 95% CI, 0.83-0.99) were each associated with risk of all-cause mortality. In the same adjusted analysis, African American race was not associated with increased mortality risk relative to white race (HR, 0.64; 95% CI, 0.36-1.14).

CONCLUSIONS

In a large managed care organization in which access to care is unlikely to vary widely, greater severity-of-asthma scores and poorer perceived asthma control scores are each associated with increased mortality risk in adults with severe asthma, but African American patients are not at increased risk for death relative to white patients.

Characterizing community-based asthma knowledge in Chicago and its high risk neighborhoods

The goal of this study was to characterize asthma knowledge in high risk neighborhoods compared to a random sample of residents in the Chicago area. The Chicago Community Asthma Survey-32 (CCAS-32) was administered to 1006 Chicago-area residents and 388 residents in 4 high-risk Chicago inner-city neighborhoods. There was a significant difference in asthma knowledge between groups. The general Chicago-area respondents have an average desirable response rate of 71.6% versus 64.7% for respondents in high-risk communities (p < 0.0001). For some aspects of asthma knowledge, e.g., nocturnal cough, cockroach allergen, and vaporizer use, general knowledge was similarly low. For other aspects, such as the need for asymptomatic asthma visits and chest tightness, there were larger gaps between residents of high risk communities and the general community. High-risk neighborhoods in Chicago had lower asthma knowledge compared to the general Chicago community. This discrepancy may be contributing to the disparities seen in asthma morbidity. Public health efforts to increase asthma knowledge in these high risk minority communities may help reduce these disparities. Important misconceptions exist about asthma triggers, signs and symptoms, especially among lower income African American communities, that should be addressed by physicians.

Frequency and correlates of overweight status in adolescent asthma

BACKGROUND

Debate exists within the literature concerning whether asthma and obesity are linked as comorbid conditions. Further study is required to understand the relationship between asthma and overweight status, and developmental considerations are an important priority area.

OBJECTIVE

The present study addressed gaps in the existing literature by comparing rates of overweight status among a matched sample of adolescents with and without asthma and by examining correlates of overweight status among youth with asthma.

METHODS

Rates and correlates of overweight status were compared among a matched cohort of 103 adolescents with asthma, 75 adolescents with asthma characterized by history of a severe acute event, and 92 normal controls.

RESULTS

Significantly higher rates of overweight status were found among the asthma groups compared to the control group and to population estimates. Significant correlates for overweight status included younger age and earlier age at asthma diagnosis, suggesting that receiving an asthma diagnoses in early childhood may increase the propensity for weight gain.

CONCLUSION

Asthma and obesity are problematic comorbid conditions, and specialized obesity prevention programs may be particularly necessary at the onset of a new asthma diagnosis.

CLINICAL IMPLICATIONS

Identifying and addressing the factors that may contribute to the potential for obesity among youth with asthma are key research and clinical practice priorities.

Caregiver depressive symptoms and observed family interaction in low-income children with persistent asthma

This study examined the relationship between caregiver depressive symptoms and observed parenting behaviors and family processes during interactions among 101 urban, low-income Africtan American families with children with persistent asthma. Caregivers (primarily female) were assessed on four dimensions (i.e., warmth/ involvement, hostility, consistent discipline, relationship quality) in three videotaped interaction tasks (loss, conflict, cohesion). The results indicated that increased depressive symptoms were significantly associated with lower warmth/involvement and synchrony scores and greater hostility scores during the loss and conflict tasks. In the total sample, the highest levels of hostility and the lowest levels of warmth/involvement were found for the conflict task; nevertheless, caregivers with moderate/severe depressive symptoms showed a significantly greater increase in hostility from the loss to the conflict task than caregivers with minimal/mild depressive symptoms. The findings highlight the salience of considering task content in family observational process research to expand our understanding of depressed and nondepressed caregivers abilities to modulate appropriately their behaviors and affect across various family interactions. Implications for improving asthma management for low-income children with persistent asthma are discussed, including the utility of multidisciplinary interventions that combine asthma education with family therapy.

Genetics of asthma: potential implications for reducing asthma disparities

Although genetic factors may partly explain the differences in asthma prevalence, morbidity, and mortality among ethnic groups in the United States, few studies of the genetics of asthma have included members of ethnic minority groups. Only one genome-wide linkage analysis of asthma and/or asthma-related phenotypes (conducted by the Collaborative Study on the Genetics of Asthma) has included any members of ethnic minority populations. The interpretation of the findings of genetic association studies of asthma in ethnic minority groups is complicated by reduced statistical power due to small sample sizes; the failure to correct for multiple comparisons; a lack of homogeneity of the populations studied with regard to area of residence, ancestral background, and/or country of origin; a lack of measurement of relevant environmental exposures; and (for case-control studies of genetic association) a lack of detection and control of potential population stratification. Genetic studies may improve our understanding of asthma and lead to new methods to prevent, diagnose, and treat this disease. Limited study of asthma genetics in ethnic minority populations is unacceptable, as it may prevent these groups from benefiting from future developments in asthma management and thus widen existing disparities in asthma care. Future genetic association studies of asthma among ethnic minorities in the United States should include large samples of populations that have been adequately defined with regard to area of residence, self-designated ancestry, and country of origin. These studies should also include an adequate assessment of potentially relevant environmental exposures and (for case-control association studies) population stratification.

Advancing a multilevel framework for epidemiologic research on asthma disparities

Our understanding of asthma epidemiology is growing increasingly complex. Asthma outcomes are clearly socially patterned, with asthma ranking as a leading cause of health disparities among minority and low socioeconomic groups. Yet, the increasing prevalence and marked disparities in asthma remain largely unexplained by known risk factors. In the United States, asthma disproportionately affects nonwhite children living in urban areas and children living in poverty. Low socioeconomic status (SES), ethnic minority group status, and residence in an inner-city environment are closely intertwined in the United States, making it a challenge to fully disentangle the independent effects of each of these characteristics on asthma morbidity. In addition, studies show geographic variation in asthma outcomes across large cities and neighborhoods within cities that cannot be explained by economic factors alone. Although more limited data are available, studies in rural areas also suggest the stratification of risk based on SES and the proportion of minorities. Among low-SES areas, those with predominantly minority, segregated populations seem especially burdened. Marginalized populations of lower socioeconomic position are disproportionately exposed to irritants (eg, tobacco smoke), pollutants (eg, diesel-related particles), and indoor allergens (eg, cockroach and mouse allergen). Moreover, these marginalized individuals may also live in communities that are increasingly socially toxic, which, in turn, may be related to the increased experience of psychosocial stress that may influence asthma morbidity. Epidemiologic trends suggest that asthma may provide an excellent paradigm for understanding the role of community-level contextual factors in disease. Specifically, a multilevel approach that includes an ecological perspective may help to explain heterogeneities in asthma expression across socioeconomic and geographic boundaries that, to date, remain largely unexplained. Traditionally, asthma epidemiology has focused on individual-level risk factors and family factors. Far less attention has been given to the broader social context in which individuals live. A multilevel approach that explicitly recognizes the embedding of asthma within its biological, psycho-socioeconomic, environmental, and community contexts, is likely to provide a better understanding of asthma disparities at different stages in the life course. Is it simply asthma disparities or is it social disparities in asthma?

The potential for reducing asthma disparities through improved family and social function and modified health behaviors

The National Workshop To Reduce Asthma Disparities assembled a multidisciplinary group comprised of scientists, clinicians, and community representatives to examine factors related to asthma disparities. Attention was given to the importance of discerning family, social, and behavioral factors that facilitate or impede the use of health-care services suitable to the medical status of an individual. This review highlights select biopsychosocial factors that contribute to these disparities, the manner in which they may contribute or protect persons affected by asthma, and recommended directions for future research.

Racial and ethnic disparities in the quality of asthma care

Racial and ethnic disparities in the quality of asthma care have been well documented in the United States. There are multiple factors associated with such disparities in asthma care, including structural barriers (eg, ability to access the health-care system), process-of-care barriers (eg, ability to navigate the health-care system), and process-of-care barriers at the interpersonal level (eg, ability to work effectively with a health-care provider) for equitable, quality asthma care. This article summarizes these issues and identifies specific areas for future investigation. At a health-systems level, further work is needed to understand how medical care financing arrangements may or may not be contributing to racial and ethnic disparities in asthma care, as well as how specific organizational initiatives can address these issues. Research needs at the patient/provider level include defining the content and methods for disseminating issues regarding cultural competency to health-care providers.

Complementary and alternative medication (CAM) use and asthma outcomes in children: an urban perspective

Asthma is a disease of significant social magnitude that disproportionately affects children from minority and low-income backgrounds. Poor asthma management is one of the leading causes for high morbidity and mortality rates. In addition to conventional medications, many parents use complementary and alternative medication (CAM) to treat their child's asthma symptoms. This study explored the impact of CAM use on asthma control and risks for nonadherence to conventional medications in 66 parents of children with asthma. Positive parental beliefs about CAM were significantly associated with greater risks for nonadherence and poorer asthma control. Future research should assess the specific pathways that may account for these associations among CAM use and asthma outcomes.

Reducing asthma health disparities in poor Puerto Rican children: the effectiveness of a culturally tailored family intervention

BACKGROUND

Island and mainland Puerto Rican children have the highest rates of asthma and asthma morbidity of any ethnic group in the United States.

OBJECTIVE

We evaluated the effectiveness of a culturally adapted family asthma management intervention called CALMA (an acronym of the Spanish for "Take Control, Empower Yourself and Achieve Management of Asthma") in reducing asthma morbidity in poor Puerto Rican children with asthma.

METHODS

Low-income children with persistent asthma were selected from a national health plan insurance claims database by using a computerized algorithm. After baseline, families were randomly assigned to either the intervention or a control group.

RESULTS

No significant differences between control and intervention group were found for the primary outcome of symptom-free days. However, children in the CALMA intervention group had 6.5% more symptom-free nights, were 3 times more likely to have their asthma under control, and were less likely to visit the emergency department and be hospitalized as compared to the control group. Caregivers receiving CALMA were significantly less likely to feel helpless, frustrated, or upset because of their child's asthma and more likely to feel confident to manage their child's asthma.

CONCLUSION

A home-based asthma intervention program tailored to the cultural needs of low income Puerto Rican families is a promising intervention for reducing asthma morbidity.

Spatial cluster detection for censored outcome data

While numerous methods have been proposed to test for spatial cluster detection, in particular for discrete outcome data (e.g., disease incidence), few have been available for continuous data that are subject to censoring. This article provides an extension of the spatial scan statistic (Kulldorff, 1997, Communications in Statistics 26, 1481-1496) for censored outcome data and further proposes a simple spatial cluster detection method by utilizing cumulative martingale residuals within the framework of the Cox's proportional hazards models. Simulations have indicated good performance of the proposed methods, with the practical applicability illustrated by an ongoing epidemiology study which investigates the relationship of environmental exposures to asthma, allergic rhinitis/hayfever, and eczema.

Are physician estimates of asthma severity less accurate in black than in white patients?

BACKGROUND

Racial differences in asthma care are not fully explained by socioeconomic status, care access, and insurance status. Appropriate care requires accurate physician estimates of severity. It is unknown if accuracy of physician estimates differs between black and white patients, and how this relates to asthma care disparities.

OBJECTIVE

We hypothesized that: 1) physician underestimation of asthma severity is more frequent among black patients; 2) among black patients, physician underestimation of severity is associated with poorer quality asthma care.

DESIGN, SETTING AND PATIENTS

We conducted a cross-sectional survey among adult patients with asthma cared for in 15 managed care organizations in the United States. We collected physicians' estimates of their patients' asthma severity. Physicians' estimates of patients' asthma as being less severe than patient-reported symptoms were classified as underestimates of severity.

MEASUREMENTS

Frequency of underestimation, asthma care, and communication.

RESULTS

Three thousand four hundred and ninety-four patients participated (13% were black). Blacks were significantly more likely than white patients to have their asthma severity underestimated (OR = 1.39, 95% CI 1.08-1.79). Among black patients, underestimation was associated with less use of daily inhaled corticosteroids (13% vs 20%, p < .05), less physician instruction on management of asthma flare-ups (33% vs 41%, p < .0001), and lower ratings of asthma care (p = .01) and physician communication (p = .04).

CONCLUSIONS

Biased estimates of asthma severity may contribute to racially disparate asthma care. Interventions to improve physicians' assessments of asthma severity and patient-physician communication may minimize racial disparities in asthma care.

Pediatric asthma: caregiver health literacy and the clinician's perception

Health literacy was assessed in pediatric asthma caregivers attending a university-based clinic. The medical provider's perception of caregiver health literacy was also examined. Eighty-six percent of the caregivers had adequate health literacy, 4% and 10% had marginal and inadequate health literacy, respectively. Health literacy was significantly higher for caregivers who were younger (p = 0.039) and had a higher level of education (p = 0.037). An agreement analysis revealed moderate agreement between provider perception of caregiver's health literacy and measured health literacy (Kappa = 0.51). The results suggest that medical providers may not accurately assess caregivers' actual health literacy level.

Understanding disparities in asthma outcomes among African Americans

Racial disparities in asthma morbidity and mortality are greater than differences in asthma prevalence. This finding suggests that following the diagnosis of asthma, blacks receive substantially different care than non-Hispanic whites, through available health care systems and their social support networks, and racial differences in relevant environ-mental exposures contribute to differences in morbidity and mortality. An overview of factors that may contribute to disparities in asthma prevalence, morbidity, and mortality,including contextual factors, is provided.

Asthma in Hispanics in the United States

The Hispanic population in the United States is diverse in many respects. Although there is marked variation in the prevalence, morbidity, and mortality of asthma among Hispanic subgroups in the United States, these differences are poorly understood. Future stu-dies of asthma should include large samples of Hispanic subgroups that are well characterized in terms of self-reported ethnicity, country of origin, place of birth, area of residence, and indicators of socioeconomic status. Because a significant proportion of Hispanics live in poverty, public health interventions aimed at improving access to health care and housing conditions would have a major impact on reducing asthma morbidity among Hispanics in the United States.

Working with a Head Start population with asthma: lessons learned

The Early Childhood Asthma Project involved asthma case identification in 35 Head Start centers in Detroit, MI, and attempted implementation of an intervention designed to help families manage a child's asthma more effectively. Surveys were distributed to the parents of all Head Start children (3408), and 2198 complete surveys were returned. Case detection found probable asthma in 30% of the children whose parent returned a sufficiently complete survey. Implementation of the intervention was unsuccessful in this setting. Obstacles to effective implementation included the sample's low participation and high attrition, limited involvement of Head Start personnel, factors related to the program approach, and the target population's beliefs about asthma.

Epidemiology of asthma

The epidemiology of asthma is complex but essential in enhancing the understanding of a disease that affects millions of patients. Asthma is associated with significant morbidity and mortality. Asthma prevalence rates in the United States reached a plateau after 1998 with an estimated overall prevalence of 3.8% in 2003. Racial disparities exist and there are staggering differences in morbidity and mortality. The analysis of data collected from epidemiologic studies continues to be a critical part of enhancing the understanding of the pathophysiology of asthma, which will lead to improved patient outcomes.