Publications by authors named "Solomon Choma"

Background: Menopause and HIV are associated with cardiometabolic disease. In sub-Saharan Africa there is a growing population of midlife women living with HIV and a high prevalence of cardiometabolic disease.

Objectives: The aim of this study was to determine whether menopause and HIV were associated with cardiometabolic disease risk factors in a population of midlife sub-Saharan African women.

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Population studies are crucial in understanding the complex interplay between the gut microbiome and geographical, lifestyle, genetic, and environmental factors. However, populations from low- and middle-income countries, which represent ~84% of the world population, have been excluded from large-scale gut microbiome research. Here, we present the AWI-Gen 2 Microbiome Project, a cross-sectional gut microbiome study sampling 1,803 women from Burkina Faso, Ghana, Kenya, and South Africa.

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Most hypertension-related genome-wide association studies (GWASs) focus on non-African populations, despite hypertension (a major risk factor for cardiovascular disease) being highly prevalent in Africa. The AWI-Gen study GWAS meta-analysis for blood pressure (BP)-related traits (systolic and diastolic BP, pulse pressure, mean-arterial pressure and hypertension) from three sub-Saharan African geographic regions (N = 10,775), identifies two novel genome-wide significant signals (p < 5E-08): systolic BP near P2RY1 (rs77846204; intergenic variant, p = 4.95E-08) and pulse pressure near LINC01256 (rs80141533; intergenic variant, p = 1.

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Background: Central obesity is a leading risk factor for cardiometabolic diseases, in which body fat accumulates to a particular extent, and may negatively impact on health. The prevalence of abdominal obesity has increased over the last 10 years and currently surpasses that of overall obesity. There is a scarcity of data on the determinants of central obesity, especially among populations residing in rural Africa.

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Objective: To compare the risk factors for cardiometabolic disease between pre- and postmenopausal women from four sub-Saharan African countries.

Study Design: This cross-sectional study included 3609 women (1740 premenopausal and 1869 postmenopausal) from sites in Ghana (Navrongo), Burkina Faso (Nanoro), Kenya (Nairobi), and South Africa (Soweto and Dikgale). Demographic, anthropometric and cardiometabolic variables were compared between pre- and postmenopausal women, within and across sites using multivariable regression analyses.

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Objectives: We investigated progression through the care cascade and associated factors for people with diabetes in sub-Saharan Africa to identify attrition stages that may be most appropriate for targeted intervention.

Design: Cross-sectional study.

Setting: Community-based study in four sub-Saharan African countries.

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Objectives: To determine the prevalence of multimorbidity, to identify which chronic conditions cluster together and to identify factors associated with a greater risk for multimorbidity in sub-Saharan Africa (SSA).

Design: Cross-sectional, multicentre, population-based study.

Setting: Six urban and rural communities in four sub-Saharan African countries.

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Article Synopsis
  • * The AWI-Gen study analyzed blood pressure traits in over 10,000 individuals from sub-Saharan Africa and identified two significant genetic signals linked to systolic and pulse pressure.
  • * Results indicate that existing polygenic risk scores from different ancestries are not very predictive for African populations, highlighting the need for diverse models for better accuracy.
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Background The major risk factors for atherosclerotic cardiovascular disease differ by race or ethnicity but have largely been defined using populations of European ancestry. Despite the rising prevalence of cardiovascular disease in Africa there are few related data from African populations. Therefore, we compared the association of established cardiovascular risk factors with carotid-intima media thickness (CIMT), a subclinical marker of atherosclerosis, between African, African American, Asian, European, and Hispanic populations.

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Background: There is evidence that microalbuminuria (urinary albumin excretion) is an early sign of vascular damage and an established risk factor for cardiovascular morbidity and mortality. This study investigated the magnitude of microalbuminuria and its association with serum lipids and inflammatory markers among a rural black population residing in the Dikgale Health and Demographic Surveillance System site, South Africa.

Methods: Data were collected from 602 presumably healthy participants (225 men and 377 women) aged ≥ 18 years.

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Importance: Carotid atherosclerosis and microalbuminuria are associated with atherosclerotic cardiovascular disease (ASCVD) but are understudied in sub-Saharan Africa.

Objective: To evaluate the association of carotid atherosclerosis and microalbuminuria with 10-year ASCVD risk in middle-aged sub-Saharan African individuals.

Design, Setting, And Participants: This cross-sectional study conducted analyses of baseline data from the African-Wits-INDEPTH (International Network for the Demographic Evaluation of Populations and Their Health in Low- and Middle-Income Countries) genomic study (AWI-Gen).

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Article Synopsis
  • - A study examined genetic susceptibility to atherosclerosis in 7,894 adults from four sub-Saharan African countries using carotid intima-media thickness (cIMT) as an indicator, finding that genetic factors play a significant role in this condition.
  • - Two new African-specific genetic loci, SIRPA and FBXL17, were identified, along with male- and female-specific loci linked to atherosclerosis, suggesting differences in genetic influences based on sex.
  • - The research confirmed previous associations from European populations while highlighting the biological relevance of certain genes related to estrogen response and their connection to cardiovascular diseases in a diverse population.
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Article Synopsis
  • Substance misuse, particularly of tobacco and alcohol, poses significant public health risks, leading to various diseases and potential substance use disorders, with a focus on middle-aged adults in four sub-Saharan African countries.* -
  • A study with 10,703 participants revealed a higher prevalence of substance use among men (68.4%) compared to women (33.3%), with men exhibiting notably higher rates of smoking (34.5% vs 2.1%) and alcohol consumption (60.3% vs 29.3%).* -
  • Findings indicated that problematic drinking patterns were more prevalent in men (18.9%) than in women (7.3%), often linked to marital status and smoking, highlighting the need
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Background: The cardiovascular health index (CVHI) introduced by the American Heart Association is a valid, accessible, simple, and translatable metric for monitoring cardiovascular health in a population. Components of the CVHI include the following seven cardiovascular risk factors (often captured as life's simple 7): smoking, dietary intake, physical activity, body mass index, blood pressure, glucose, and total cholesterol. We sought to expand the evidence for its utility to under-studied populations in sub-Saharan Africa, by determining its association with common carotid intima-media thickness (CIMT).

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Moringa oleifera (MO) is an excellent source of dietary antioxidant. MO is used traditionally to enhance libido and as an aphrodisiac in the treatment of sexual dysfunction. This study aimed to investigate the direct effect of aqueous leaf extract of MO on Leydig cell in vitro.

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Background: The aim of the study was to determine the prevalence and determinants of chronic non-communicable disease (NCD) risk factors in a rural community in the Limpopo Province of South Africa.

Methods: This survey was conducted using the WHO "STEPwise approach to the surveillance of non-communicable diseases" (STEPS) methodology. Participants were residents of the Dikgale HDSS site and standardised international protocols were used to measure behavioural risk factors (smoking, alcohol consumption, fruit and vegetable intake and, physical activity) and physical characteristics (weight, height, waist and hip circumferences and blood pressure-BP).

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The association between obesity and iron status has a long history and is still receiving attention. However comparative analysis of the association between general obesity (BMI) and visceral obesity (waist circumference) with iron status has not been extensively researched. The aim of the present study is thus to determine if body mass index and waist circumference have the same correlation with iron status.

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Purpose: We investigated the distribution of objectively measured ambulation levels and the association of ambulation levels to adiposity levels in a convenience sample of adolescent and adult, rural black South Africans.

Methods: We analyzed 7-d pedometry data, collected over a period of nine consecutive days, in 789 subjects (women, n = 516; men, n = 273). Adiposity measures included body mass index (BMI) and waist circumference (WC).

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