Estimate of the incidence of bladder cancer in Africa: A systematic review and Bayesian meta-analysis

OBJECTIVES

To quantify the epidemiology of bladder cancer in Africa to guide a targeted public health response and support research initiatives.

METHODS

We systematically searched publicly available sources for population-based registry studies reporting the incidence of bladder cancer in Africa between January 1980 and June 2017. Crude incidence rates of bladder cancer were extracted. A Bayesian network meta-analysis model was used to estimate incidence rates.

RESULTS

The search returned 1328 studies. A total of 22 studies carried out across 15 African countries met our pre-defined selection criteria. Heterogeneity across studies was high (I2  = 98.9%, P < 0.001). The pooled incidence of bladder cancer in Africa was 7.0 (95% credible interval 5.8-8.3) per 100 000 population in men and 1.8 (95% credible interval 1.2-2.6) per 100 000 in women. The incidence of bladder cancer was consistently higher in North Africa in both sexes. Among men, we estimated a pooled incidence of 10.1 (95% credible interval 7.9-11.9) per 100 000 in North Africa and 5.0 (95% credible interval 3.8-6.6) per 100 000 in sub-Saharan Africa. In women, the pooled incidence was 2.0 (95% credible interval 1.0-3.0) per 100 000 and 1.5 (95% credible interval 0.9-2.0) per 100 000 in North Africa and sub-Saharan Africa, respectively. Incidence rates increased significantly among men from 5.6 (95% credible interval 4.2-7.2) in the 1990s to 8.5 (95% credible interval 6.9-10.1) per 100 000 in 2010.

CONCLUSIONS

The present study suggests a growing incidence of bladder cancer in Africa in recent years, particularly among men and in North Africa. This study also highlights the lack of quality data sources and collection of essential clinical and epidemiological data in several African countries, and this hinders public health planning.

Influence of Cancer Worry on Four Cancer Related Health Protective Behaviors among a Nationally Representative Sample: Implications for Health Promotion Efforts

The aims of this study were to assess what sociodemographic characteristics are associated with cancer worry and what the influence of cancer worry is on four cancer-related protective health behaviors. Data from the Health Information National Trends Survey (HINTS) (4th cycle of the 4th iteration) were used. Multiple regression models were used for all analyses. Behaviors analyzed were as follows: physical activity, diets, smoking, and routine medical screening. Demographics controls included participant age, income, body mass index (BMI), race/ethnicity, and education. N = 2630, Older participants (OR = .99, p < .001), participants with higher BMI (OR = 1.01, p = .017), females (OR = 1.39, p < .001), and highly educated participants were more likely to worry about cancer. Cancer worry was not a significant predictor of exercise, healthy eating, or cancer screening behaviors. However, participants who worried about cancer were more likely to be current smokers (RRR = 1.20, p < .001) compared to participants who never smoked. Although, worry is only an emotional influence on health behavior and may be short-lived, the influence of worry on health-related decision making is likely to be lasting even when the emotions are no longer present.

Examining characteristics of recorded and unrecorded alcohol consumers in Kenya

BACKGROUND

Due to media reports of several deaths, consumption of unrecorded alcohol (i.e., alcohol brewed at home) has emerged as a public health threat in developing countries like Kenya. Empirical data on this issue, however, is scarce. This investigation compared demographic characteristics of Kenyans who drank recorded (regulated) and unrecorded alcohol.

METHODS

We examined all respondents who consumed alcohol in the past month (N = 718) on the 2015 nationally representative Kenya STEPwise survey. Descriptive statistics and bivariate logistic regression examined proportion of respondents consuming unrecorded alcohol, and social demographic factors associated with unrecorded alcohol consumption, respectively.

RESULTS

The sample was primarily male (86%), married (64%), middle class or higher (64%), with an average age of 37 years. Participants reported an average of 2.5 drinking events and 4.3 binge-drinking occasions per month. Overall, 37% of our sample consumed unrecorded alcohol. Compared to those with incomplete primary education or lower, individuals who completed primary education or above were less likely to report consuming unrecorded alcohol (OR = 0.22, 95% CI: 0.12-0.43). Compared to poorest and poor respondents, those identifying as middle class or above were less likely to consume unrecorded alcohol (OR = 0.47, 95% CI: 0.29-.78). Current smokers (OR = 2.19, 95% CI: 1.34-3.60) and those with higher binge drinking occasions in the past month (OR = 1.03, 95% CI: 1.004-1.07) were significantly more likely to consume unrecorded alcohol.

CONCLUSION

Kenyan adults who consume unrecorded alcohol engage in more binge drinking occasions, smoke, and have lower levels of education and socioeconomic status. It is vital that health promotion interventions aimed at reducing unrecorded alcohol consumption be tailored and targeted to individuals with low socio-economic status in Kenya.

Estimating the incidence of breast cancer in Africa: a systematic review and meta-analysis

Background

Breast cancer is estimated to be the most common cancer worldwide. We sought to assemble publicly available data from Africa to provide estimates of the incidence of breast cancer on the continent.

Methods

A systematic search of Medline, EMBASE, Global Health and African Journals Online (AJOL) was conducted. We included population- or hospital-based registry studies on breast cancer conducted in Africa, and providing estimates of the crude incidence of breast cancer among women. A random effects meta-analysis was employed to determine the pooled incidence of breast cancer across studies.

Results

The literature search returned 4648 records, with 41 studies conducted across 54 study sites in 22 African countries selected. We observed important variations in reported cancer incidence between population- and hospital-based cancer registries. The overall pooled crude incidence of breast cancer from population-based registries was 24.5 per 100 000 person years (95% confidence interval (CI) 20.1-28.9). The incidence in North Africa was higher at 29.3 per 100 000 (95% CI 20.0-38.7) than Sub-Saharan Africa (SSA) at 22.4 per 100 000 (95% CI 17.2-28.0). In hospital-based registries, the overall pooled crude incidence rate was estimated at 23.6 per 100 000 (95% CI 18.5-28.7). SSA and Northern Africa had relatively comparable rates at 24.0 per 100 000 (95% CI 17.5-30.4) and 23.2 per 100 000 (95% CI 6.6-39.7), respectively. Across both registries, incidence rates increased considerably between 2000 and 2015.

Conclusions

The available evidence suggests a growing incidence of breast cancer in Africa. The representativeness of these estimates is uncertain due to the paucity of data in several countries and calendar years, as well as inconsistency in data collation and quality across existing cancer registries.

An Examination of Family, Healthcare Professionals, and Peer Advice on Physical Activity Behaviors among Adolescents at High Risk for Type 2 Diabetes

Studies have shown that many college students do not meet the recommended daily physical activity (PA) levels, and about 22% of these students are overweight. Given that engaging in PA is a protective behavior against many chronic conditions, it is imperative to understand what sources of information/advice to engage in PA is most influential. Hence, the purpose of this study was to examine the relative impact of different sources of advice regarding exercise and PA on actual PA engagement among obese/overweight adolescents. Using data from 319 overweight/obese college students, multivariate regression analyses were conducted to examine which source of advice (from parents, peers, or healthcare provider) to engage in PA was associated with PA behavior among these adolescents. Influence of type 2 diabetes (T2D) family history on PA behavior was also examined. Moderate and vigorous PA behavior was more likely among obese/overweight adolescents who received advice to exercise or engage in PA from their peers (B = 200.85, β = 0.193, p = 0.001; B = 121.19, β = 0.145, p = 0.014). Overweight/obese adolescents with a T2D family history were more likely to walk compared with those without a T2D family history (χ² = 12.97, p = 0.000). Findings suggest that although healthcare professionals advise obese/overweight adolescents, those who received advice regarding PA behavior from their peers were more likely to heed the advice and exercise/engage in PA. In essence, intervention efforts should focus on employing peer ambassadors to counsel other adolescents on the importance of PA.

Coverage and determinants of childhood immunization in Nigeria: A systematic review and meta-analysis

INTRODUCTION

The proportion of fully immunized children in Nigeria is reportedly low. There are concerns over national immunization data quality, with this possibly limiting country-wide response. We reviewed publicly available evidence on routine immunization across Nigeria to estimate national and zonal coverage of childhood immunization and associated determinants.

METHODS

A systematic search of Medline, EMBASE, Global Health and African Journals Online (AJOL) was conducted. We included population-based studies on childhood immunization in Nigeria. A random effects meta-analysis was conducted on extracted crude rates to arrive at national and zonal pooled estimates for the country.

RESULTS

Our search returned 646 hits. 21 studies covering 25 sites and 26,960 children were selected. The estimated proportion of fully immunized children in Nigeria was 34.4% (95% confidence interval [CI]: 27.0-41.9), with South-south zone having the highest at 51.5% (95% CI: 20.5-82.6), and North-west the lowest at 9.5% (95% CI: 4.6-14.4). Mother's social engagements (OR=4.0, 95% CI: 1.9-8.1) and vaccines unavailability (OR=3.9, 95% CI: 1.2-12.3) were mostly reported for low coverage. Other leading determinants were vaccine safety concerns (OR=3.0, 95% CI: 0.9-9.4), mother's low education (OR=2.5, 95% CI: 1.8-3.6) and poor information (OR=2.0, 95% CI: 0.8-4.7).

CONCLUSION

Our study suggests a low coverage of childhood immunization in Nigeria. Due to the paucity of data in the Northern states, we are still uncertain of the quality of evidence presented. It is hoped that this study will prompt the needed research, public health and policy changes toward increased evenly-spread coverage of childhood immunization in the country.

Impact of Type 2 Diabetes Threat Appraisal on Physical Activity and Nutrition Behaviors among Overweight and Obese College Students

OBJECTIVE

We examined the impact of threat appraisal (TA) on Type 2 diabetes (T2D)-related protective behaviors among high-risk college students.

METHODS

Using a Web-based survey, we collected data from 319 overweight or obese undergraduate students attending one of 4 Texas colleges/universities. Hierarchical multiple regression analyses determined the association between the outcome variable, fruits and vegetables (F&V) consumption and physical activity (PA), and TA.

RESULTS

Demographic characteristics were entered at step 1, explaining 7% of variance in F&V consumption and 6% in PA. After TA was entered in block 2, the total variance explained changed by only .008% for F&V consumption and .009% for PA.

CONCLUSIONS

TA did not predict T2D protective behaviors and reduced variability in the model. Being female, as well as having a T2D family history, was significantly associated with increased TA. Results can inform the planning, implementing, and evaluating of health promotion programs.

Risk Perceptions for Developing Type 2 Diabetes among Overweight and Obese Adolescents with and without a Family History of Type 2 Diabetes

OBJECTIVES

Examine risk perceptions among overweight and obese adolescents for developing Type 2 Diabetes (T2D) compared to their peers, in adulthood and in their lifetime.

METHODS

Participants (N = 319) were overweight/obese college-aged students. Multiple linear regression analyses examined the predictive relationship of the independent variables on comparative, absolute and 5-year perceived risk for developing T2D.

RESULTS

Female adolescents (β=0.186, p < .05), those with a T2D family history (β=0.147, p < .05) and BMI (β=0.315, p < .05), had a positive statistically significant relationship with comparative, absolute, and 5-year T2D risk perceptions. Although most respondents reported behavioral risk factors for developing T2D, behavioral causal belief had no statistically significant (p > .05) association with personal T2D risk assessment.

CONCLUSIONS

The at-risk participants in this investigation primarily based their T2D risk assessment on non-modifiable factors, possible undervaluing the influence of behavioral risk and protective factors. Future work should seek to improve awareness of the influence of behavioral factors and also seek to increase the perceived risk of not engaging in protective behaviors such as physical activity and weight management.

Influence of the Home Food Environment on Children's Fruit and Vegetable Consumption: A Study of Rural Low-Income Families

BACKGROUND

This investigation sought to identify micro-level built and sociocultural characteristics of a home food environment that have been theoretically linked with fruit and vegetable (F&V) consumption.

METHOD

We examined rural families (n = 298) from the southeastern United States. Hierarchical multiple regression analyses determined the association between the outcome variable (F&V consumption) and micro-level built and sociocultural characteristics of a home food environment.

RESULTS

Demographic characteristics were entered at Step 1, explaining 14% of variance in vegetable consumption and 9% in fruit consumption. After entry of sociocultural factors in the home food environment, such as parenting styles and so on, in Block 2, the total variance explained increased by 25% for vegetable consumption and 12% for fruit consumption. Micro-level built environmental factors such as the availability of F&V in the home was entered at Block 3, total variance explained by the model for vegetable consumption was 67%, F(17, 111) = 13.5, p < .001, and for fruit consumption was 57%, F(17, 160) = 12.5, p < .001.

CONCLUSION

F&V availability was the most important variable influencing a child's consumption of F&V. There are modifiable factors within the rural low-income home that could serve as priorities for intervention to improve F&V consumption.