Advances and innovations in methods for collecting egocentric network data

This article reviews recent methodological research that bears on the collection of egocentric network data. It begins with background on setting egocentric network boundaries and principal types of instruments that obtain information about such networks. It then discusses innovations in data collection and studies of data quality. The bulk of these address questions about "name generator" instruments that obtain information about the alters and relationships in a subject's network. Among topics receiving substantial attention in recent research are mitigation of respondent burden, interviewer effects, survey mode, and the performance of name generators in longitudinal studies. Potentially fruitful innovations supplement conventional question-and-answer surveys with visual elements that promise to better engage respondents and reduce the demands that name generator-based data collection poses. We close by highlighting both accomplishments of this body of research and some open issues.

Work Values in the United States: Age, Period, and Generational Differences

This article examines how processes of aging, generational shifts, and changes over historical time periods shape differences in work values in the United States. Our analyses of data from the General Social Surveys and the International Social Survey Program show that changes over historical time periods are most consistently responsible for temporal differences in work values. In particular, during recent periods Americans tend to place greater importance on jobs that provide security, high income and opportunities for advancement; this is consistent with a narrative that these job rewards have become more difficult to attain recently and are thus more problematic for workers. Some differences in work values are also attributable to aging or life course processes, especially the greater importance placed on high income during the mid-life years when family responsibilities are generally greatest. By contrast, we find few differences in work values among members of different generations or cohorts. We also find that people from less advantaged social origins and those with greater labor market resources are more likely to value economic rewards.

Changing work values in the United States, 1973-2006

This article examines changes in workers' work values for the period 1973-2006 using General Social Survey data. We assess the relative importance that workers assign to high income, as opposed to security, advancement, short hours and "importance and sense of accomplishment." The latter ranked highest throughout this period, but the relative priority placed on income and job security generally increased. We suggest that the rising relative rankings of earnings and job security reflect growing job, employability, and economic insecurity that workers generally experienced during this period, making these job characteristics generally more difficult to attain. Groups most vulnerable to job, employability, and economic insecurity-such as less educated workers and blacks-were most apt to place high importance on income and security. Differences in rankings between men and women, blacks and nonblacks, and college and high school graduates remained fairly stable over this period.

Differences in patient and clinic characteristics at CARE Act funded versus non-CARE Act funded HIV clinics

The Ryan White CARE Act supports comprehensive care to persons with HIV infection. With an annual budget of over $1 billion, it is the largest federally funded programme for HIV care in the USA. We analysed data from the HIV Costs and Services Utilization Study, a nationally representative sample of HIV patients. Patient data were collected in 1996-97 and clinic data were collected in 1998-99. We examined whether CARE Act funded clinics differed from other HIV clinics in (1) the characteristics of their patients, and (2) their organization, staffing, and services. We found that patients at CARE Act clinics were younger, less educated, poorer, and more likely to be female, non-white, unemployed, uninsured, and have heterosexual contact as an HIV risk factor, compared to patients at other HIV clinics. CARE Act clinics tended to specialize in HIV care, had more infectious disease specialists, had fewer total patients, and provided more support services (e.g. mental health, nutrition, case management, child care). These results are consistent with findings of other studies that were limited by non-probability samples or restricted geographical areas.

Gender differences in the relationships of cardiovascular symptoms and somatosensory amplification to mortality

Symptoms of angina and dyspnea predict coronary artery disease and death less well in women than in men. Greater somatosensory amplification - a psychosocial propensity to report symptoms of physical discomfort - may lead women to report relatively high levels of angina and dyspnea for reasons unrelated to coronary disease, reducing their associations with mortality. We assessed this hypothesis in a nationally representative survey of U.S. adults. When stratified by gender, angina and dyspnea significantly predicted mortality among men, but predicted it less well among women. After adjusting for amplification, cardiovascular symptoms did not predict mortality among women, but amplification was positively associated with mortality among older women.

The effect of care team composition on the quality of HIV care

Compared to single-clinician care, care provided by multiple clinicians might result in higher-quality care, especially if some of them have condition-specific expertise and complementary knowledge, skills, and roles. Individual physician continuity, which has been shown to be associated with care quality, necessarily decreases when care is provided by multiple clinicians. This study uses data from the HIV Cost and Services Utilization Study to assess the effect of care team composition on the quality of HIV care. In adjusted analyses, care teams composed of three or more clinicians were associated with more consistent prescribing of pneumocystis carinii pneumonia prophylaxis when medically indicated ( p < .01). Patients with multiple physicians generally reported worse care coordination, however, and had more inappropriate use of emergency services. These findings indicate both advantages and disadvantages to having multiple clinicians. More effort should be devoted to facilitating coordination when multiple clinicians provide care.

Correlations among measures of quality in HIV care in the United States: cross sectional study

OBJECTIVE

To determine whether a selected set of indicators can represent a single overall quality construct.

DESIGN

Cross sectional study of data abstracted during an evaluation of an initiative to improve quality of care for people with HIV.

SETTING

69 sites in 30 states.

DATA SOURCES

Medical records of 9020 patients.

MAIN OUTCOME MEASURES

Adjusted performance rates at site level for eight measures of quality of care specific to HIV and a site level summary performance score (the number of measures for which the site was in the top quarter of the distribution).

RESULTS

Of 28 site level correlations between measures, two were greater than 0.40, two were between 0.30 and 0.39, four were between 0.20 and 0.29, and the 20 remaining were all less than 0.20. One site was in the top quarter for seven measures, but no sites were in the top quarter for six or eight of the measures. Across the eight quality measures, sites were in the top quarter no more often than predicted by a chance (binomial) distribution.

CONCLUSIONS

The quality suggested by one measured indicator cannot necessarily be generalised to unmeasured indicators, even if this might be expected for clinical or other reasons.

The impact of a quality improvement program on systems, processes, and structures in medical clinics

OBJECTIVE

We sought to assess whether participation in a quality-improvement collaborative changed care processes, systems, and organization of outpatient human immunodeficiency virus (HIV) clinics.

METHODS

We surveyed clinicians, medical directors, and HIV program administrators before and after an 18-month quality improvement collaborative at 54 intervention and 37 control clinics providing HIV care. Surveys assessed clinic structures, processes, systems, and culture. During the collaborative, a clinician-administrator team from each intervention clinic attended 4 2-day sessions on quality improvement techniques. Conference calls, a website, and an e-mail list provided support and facilitated communication among collaborative participants.

RESULTS

Survey response rates were 85% or greater. Six of 54 organizational measures differed significantly between baseline and follow-up. Intervention clinicians reported greater computer availability (82% vs. 67%, P = 0.03) and use (3.13 vs. 2.68, P = 0.02; 4-point scale), attended more local (14.2 vs. 8.6, P < 0.01) and national (4.1 vs. 2.9, P = 0.01) conferences, and rated leaders' ability to implement quality improvement higher (3.8 vs. 3.4, P = 0.01; 5-point scale). Intervention directors were more likely to compare quality data to other clinics (79% vs. 54%, P = 0.04). For the set of 54 measures, intervention clinics were more likely to have higher post-intervention scores than controls (sign test, mean = 14.5, P < 0.0001).

CONCLUSIONS

A quality-improvement collaborative for HIV clinics resulted in modest organizational changes. Achieving greater change may require more focused and/or intensive interventions, greater resources for participating clinics, and better developed information technology.

Factors affecting influential discussions among physicians: a social network analysis of a primary care practice

BACKGROUND

Physicians often rely on colleagues for new information and advice about the care of their patients.

OBJECTIVE

Evaluate the network of influential discussions among primary care physicians in a hospital-based academic practice.

DESIGN

Survey of physicians about influential discussions with their colleagues regarding women's health issues. We used social network analysis to describe the network of discussions and examined factors predictive of a physician's location in the network.

SUBJECTS

All 38 primary care physicians in a hospital-based academic practice.

MEASUREMENTS

Location of physician within the influential discussion network and relationship with other physicians in the network.

RESULTS

Of 33 responding physicians (response rate = 87%), the 5 reporting expertise in women's health were more likely than others to be cited as sources of influential information (odds ratio [OR] 6.81, 95% Bayesian confidence interval [CI] 2.25-23.81). Physicians caring for more women were also more often cited (OR 1.03, 95% CI 1.01-1.05 for a 1 percentage-point increase in the proportion of women patients). Influential discussions were more frequent among physicians practicing in the same clinic within the practice than among those in different clinics (OR 5.03, 95% CI 3.10-8.33) and with physicians having more weekly clinical sessions (OR 1.33, 95% CI 1.15 to 1.54 for each additional session).

CONCLUSIONS

In the primary care practice studied, physicians obtained information from colleagues with greater expertise and experience as well as colleagues who were accessible based on location and schedule. It may be possible to organize practices to promote more rapid dissemination of high-quality evidence-based medicine.

Voluntary physician switching by human immunodeficiency virus-infected individuals: a national study of patient, physician, and organizational factors

OBJECTIVE

We sought to assess which patient, physician, and organizational factors are related to voluntary physician switching among human immunodeficiency virus (HIV)-infected patients.

DESIGN

We analyzed the results from a 3-wave survey of patients conducted by the HIV Cost and Services Utilization Study (HCSUS), a longitudinal study of a nationally representative sample of noninstitutionalized HIV-infected individuals receiving care in the contiguous United States. Physicians providing care and care site directors were surveyed once. Relationships of interpersonal aspects of care, access and continuity, technical quality of care, and physician and site characteristics to voluntary switching were analyzed using multilevel logistic regression models that nested repeated observations within patients, patients within clinicians, and clinicians within region.

RESULTS

Approximately 15% of patients voluntarily changed their usual clinicians during the 2-year study period. In a multivariate model, lower voluntary switching was predicted by patient trust (odds ratio [OR]=0.74; 95% confidence interval [95% CI]=0.61-0.90), physician antiretroviral knowledge (OR=0.26; 95% CI 0.13-0.53), moderate (rather than low or high) HIV patient volume at a care site (OR=0.09; 95% CI=0.03-0.31), and Ryan White Care Act funding (OR=0.27, 95% CI=0.14-0.52).

CONCLUSIONS

Patients with chronic illnesses may use several markers of specialization and technical quality to make decisions about their care. These results challenge the notion that patients cannot assess the quality of care they receive.

Gender differences in quality of HIV care in Ryan White CARE Act-funded clinics

BACKGROUND

Women with HIV infection have lagged behind men in receipt of critical health care, but it is not known if those disparities are due in part to where women receive care. We examined differences in care received by HIV-infected women and men in a national sample of Ryan White CARE Act-funded clinics and explored the influence of clinic characteristics on care quality.

METHODS

Record review was done on a sample of 9,015 patients who received care at 69 CARE Act-funded HIV primary care clinics that participated in a quality improvement study. Outcome measures studied were highly active antiretroviral therapy (HAART) use, HIV viral suppression, Pneumocystis jiroveci pneumonia (PCP) prophylaxis, screening, and other disease prevention efforts.

RESULTS

Women were less likely than men to receive HAART (78% versus 82%, p < .001), receive PCP prophylaxis (65% versus 75%, p < .0001), or have their hepatitis C virus status known (87% versus 88%, p = .02) despite being seen more regularly (69% versus 66%, p = .04). Sites serving high percentages of women delivered similar or better care for both men and women than other sites. Although sites serving a higher percent of women had more support services such as case management and onsite obstetrician-gynecologists and provided Pap smears at higher rates, women at such sites remained less likely than men to receive important HIV care including HAART and PCP prophylaxis.

CONCLUSIONS

The gap in the quality of care provided to HIV-infected men and women in critical areas persists, and is not explained by the types of sites where men and women receive care.

The reliability of survey assessments of characteristics of medical clinics

OBJECTIVE

To assess the reliability of survey measures of organizational characteristics based on reports of single and multiple informants.

DATA SOURCE

Survey of 330 informants in 91 medical clinics providing care to HIV-infected persons under Title III of the Ryan White CARE Act.

STUDY DESIGN

Cross-sectional survey.

DATA COLLECTION METHODS

Surveys of clinicians and medical directors measured the implementation of quality improvement initiatives, priorities assigned to aspects of HIV care, barriers to providing high-quality HIV care, and quality improvement activities. Reliability of measures was assessed using generalizability coefficients. Components of variance and clinician-director differences were estimated using hierarchical regression models with survey items and informants nested within organizations.

PRINCIPAL FINDINGS

There is substantial item- and informant-related variability in clinic assessments that results in modest or low clinic-level reliability for many measures. Directors occasionally gave more optimistic assessments of clinics than did clinicians.

CONCLUSIONS

For most measures studied, obtaining adequate reliability requires multiple informants. Using multiple-item scales or multiple informants can improve the psychometric performance of measures of organizational characteristics. Studies of such characteristics should report the organizational level reliability of the measures used.

Quality of HIV care provided by nurse practitioners, physician assistants, and physicians

BACKGROUND

Nurse practitioners (NPs) and physician assistants (PAs) are primary care providers for patients with HIV in some clinics, but little is known about the quality of care that they provide.

OBJECTIVE

To compare the quality of care provided by NPs and PAs with that provided by physicians.

DESIGN

Cross-sectional analysis.

SETTING

68 HIV care sites, funded by Ryan White Comprehensive AIDS Resources Emergency (CARE) Act Title III, in 30 different states.

PARTICIPANTS

The authors surveyed 243 clinicians (177 physicians and 66 NPs and PAs) and reviewed medical records of 6651 persons with HIV or AIDS.

MEASUREMENTS

8 quality-of-care measures assessed by medical record review.

RESULTS

After adjustments for patient characteristics, 6 of the 8 quality measures did not statistically significantly differ between NPs and PAs and either infectious disease specialists or generalist HIV experts. Adjusted rates of purified protein derivative testing and Papanicolaou smears were statistically significantly higher for NPs and PAs (0.63 and 0.71, respectively) than for infectious disease specialists (0.53 [P = 0.007] and 0.56 [P = 0.001], respectively) or generalist HIV experts (0.47 [P < 0.001] and 0.62 [P = 0.025], respectively). Nurse practitioners and PAs had statistically significantly higher performance scores than generalist non-HIV experts on 6 of the 8 quality measures.

LIMITATIONS

These results may not be generalizable to care settings where on-site physician HIV experts are not accessible or to measures of more complex clinical processes.

CONCLUSIONS

For the measures examined, the quality of HIV care provided by NPs and PAs was similar to that of physician HIV experts and generally better than physician non-HIV experts. Nurse practitioners and PAs can provide high-quality care for persons with HIV. Preconditions for this level of performance include high levels of experience, focus on a single condition, and either participation in teams or other easy access to physicians and other clinicians with HIV expertise.

Physician specialization and the quality of care for human immunodeficiency virus infection

BACKGROUND

There is debate over the types of physicians who should treat patients with complex chronic medical conditions such as human immunodeficiency virus (HIV) infection. We sought to assess the relationship between specialty training and expertise and the quality of care delivered to patients with HIV infection.

METHODS

We selected random samples of HIV-infected patients receiving care at 64 Ryan White CARE (Comprehensive AIDS Resources Emergency) Act-funded clinics throughout the country and their primary HIV physicians for an observational cohort study in which quality-of-care measures were assessed by medical record review.

RESULTS

We studied 5247 patients linked to 177 physicians who responded to a survey. Fifty-eight percent of the physicians were general medicine physicians ("generalists") and 42% were infectious diseases specialists. Sixty-three percent of the generalists (37% overall) considered themselves expert in HIV care. In hierarchical logistic regression models that controlled for patient characteristics, infectious diseases physicians and expert generalists had similar performance. In contrast, nonexpert generalists delivered lower quality care. More than 80% of the appropriate patients being cared for by infectious diseases physicians and expert generalists were receiving highly active antiretroviral therapy, compared with 73% of appropriate patients of nonexpert generalists (P<.001). Physicians with fewer than 20 patients with active HIV had fewer appropriate patients on highly active antiretroviral therapy (73% vs 82% of physicians with >/=20 such patients, P = .04) and saw patients less frequently.

CONCLUSION

These findings extend previous work by examining a range of quality-of-care measures and suggest that generalists with appropriate experience and expertise in HIV care can provide high-quality care to patients with this complex chronic illness.

Effects of a quality improvement collaborative on the outcome of care of patients with HIV infection: the EQHIV study

BACKGROUND

Multi-institution collaborative quality improvement programs are a well-established and broadly applicable quality improvement strategy, but there is little systematic assessment their effectiveness.

OBJECTIVE

To evaluate the effectiveness of a quality improvement collaborative in improving the quality of care for HIV-infected patients.

DESIGN

Controlled pre- and postintervention study.

SETTING

Clinics receiving funding from the Ryan White Comprehensive AIDS Resources Emergency Act.

PARTICIPANTS

44 intervention clinics and 25 control clinics matched by location (urban or rural), region, size, and clinic type.

MEASUREMENTS

Changes in quality-of-care measures abstracted from medical records of pre- and postintervention samples of patients at each study clinic. Measures examined included use and effectiveness of antiretroviral therapy, screening and prophylaxis, and access to care.

INTERVENTION

A multi-institutional quality improvement collaborative (the "Breakthrough Series").

RESULTS

9986 patients were studied. Clinical and sociodemographic characteristics of the intervention and control patients were similar (P > 0.05). Differences in changes in the quality of care were not statistically significant. The proportion of patients with a suppressed viral load increased by 11 percentage points (from 40.1% to 51.1%) in the intervention group compared with 5.3 percentage points (from 43.6% to 48.8%) in the control group, but this difference was not statistically significant (P = 0.18). In addition, rates of appropriate screening tests and prophylaxis did not differ between intervention and control sites.

LIMITATIONS

It was not possible to perform a pure randomized trial of the intervention or to assess other measures of quality, such as adherence and satisfaction.

CONCLUSIONS

This prospective, matched study of almost 10 000 patients found that a quality improvement collaborative did not significantly affect the quality of care. Additional research is needed to improve methods of teaching and implementing quality improvement programs to achieve better results.