Counting adolescents in: the development of an adolescent health indicator framework for population-based settings.

Changing realities in low- and middle-income countries (LMICs) in terms of inequalities, urbanization, globalization, migration, and economic adversity shape adolescent development and health, as well as successful transitions between adolescence and young adulthood. It is estimated that 90% of adolescents live in LMICs in 2019, but inadequate data exist to inform evidence-based and concerted policies and programs tailored to address the distinctive developmental and health needs of adolescents. Population-based data surveillance such as Health and Demographic Surveillance Systems (HDSS) and school-based surveys provide access to a well-defined population and provide cost-effective opportunities to fill in data gaps about adolescent health and well-being by collecting population-representative longitudinal data. The Africa Research Implementation Science and Education (ARISE) Network, therefore, systematically developed adolescent health and well-being indicators and a questionnaire for measuring these indicators that can be used in population-based LMIC settings. We conducted a multistage collaborative and iterative process led by network members alongside consultation with health-domain and adolescent health experts globally. Seven key domains emerged from this process: socio-demographics, health awareness and behaviors; nutrition; mental health; sexual and reproductive health; substance use; and healthcare utilization. For each domain, we generated a clear definition; rationale for inclusion; sub-domain descriptions, and a set of questions for measurement. The ARISE Network will implement the questionnaire longitudinally (i.e., at two time-points one year apart) at ten sites in seven countries in sub-Saharan Africa and two countries in Asia. Integrating the questionnaire within established population-based data collection platforms such as HDSS and school settings can provide measured experiences of young people to inform policy and program planning and evaluation in LMICs and improve adolescent health and well-being.

The COVID-19 pandemic and its impacts on diet quality and food prices in sub-Saharan Africa.

BACKGROUND: Sub-Saharan Africa faces prolonged COVID-19 related impacts on economic activity, livelihoods and nutrition, with recovery slowed down by lagging vaccination progress. OBJECTIVE: This study investigated the economic impacts of COVID-19 on food prices, consumption and dietary quality in Burkina Faso, Ethiopia, Ghana, Nigeria, and Tanzania. METHODS: We conducted a repeated cross-sectional study using a mobile platform to collect data from July-December, 2021 (round 2). We assessed participants' dietary intake of 20 food groups over the previous seven days and computed the primary outcome, the Prime Diet Quality Score (PDQS), and Dietary Diversity Score (DDS), with higher scores indicating better quality diets. We used generalized estimating equation (GEE) linear regression models to assess factors associated with diet quality during COVID-19. RESULTS: Most of the respondents were male and the mean age was 42.4 (±12.5) years. Mean PDQS (±SD) was low at 19.4(±3.8), out of a maximum score of 40 in this study. Respondents (80%) reported higher than expected prices for all food groups. Secondary education or higher (estimate: 0.73, 95% CI: 0.32, 1.15), medium wealth status (estimate: 0.48, 95% CI: 0.14, 0.81), and older age were associated with higher PDQS. Farmers and casual laborers (estimate: -0.60, 95% CI: -1.11, -0.09), lower crop production (estimate: -0.87, 95% CI: -1.28, -0.46) and not engaged in farming (estimate: -1.38, 95% CI: -1.74, -1.02) were associated with lower PDQS. CONCLUSION: Higher food prices and lower diet quality persisted during the COVID-19 pandemic. Economic and social vulnerability and reliance on markets (and lower agriculture production) were negatively associated with diet quality. Although recovery was evident, consumption of healthy diets remained low. Systematic efforts to address the underlying causes of poor diet quality through transforming food system value chains, and mitigation measures, including social protection programs and national policies are critical.

COVID-19 Preventive Practices, Psychological Distress, and Reported Barriers to Healthcare Access during the Pandemic among Adult Community Members in Sub-Saharan Africa: A Phone Survey.

The COVID-19 pandemic has had serious negative health and economic impacts in sub-Saharan Africa. Continuous monitoring of these impacts is crucial to formulate interventions to minimize the consequences of COVID-19. This study surveyed 2,829 adults in urban and rural sites among five sub-Saharan African countries: Burkina Faso, Ethiopia, Nigeria, Tanzania, and Ghana. Participants completed a mobile phone survey that assessed self-reported sociodemographics, COVID-19 preventive practices, psychological distress, and barriers to healthcare access. A modified Poisson regression model was used to estimate adjusted prevalence ratios (aPRs) and 95% CIs to investigate potential factors related to psychological distress and barriers to reduced healthcare access. At least 15.6% of adults reported experiencing any psychological distress in the previous 2 weeks, and 10.5% reported that at least one essential healthcare service was difficult to access 2 years into the pandemic. The majority of participants reported using several COVID-19 preventive methods, with varying proportions across the sites. Participants in the urban site of Ouagadougou, Burkina Faso (aPR: 2.29; 95% CI: 1.74-3.03) and in the rural site of Kintampo, Ghana (aPR: 1.68; 95% CI: 1.21-2.34) had a higher likelihood of experiencing any psychological distress compared with those in the rural area of Nouna, Burkina Faso. Loss of employment due to COVID-19 (aPR: 1.77; 95% CI: 1.47-2.11) was also associated with an increased prevalence of psychological distress. The number of children under 5 years in the household (aPR: 1.23; 95% CI: 1.14-1.33) and participant self-reported psychological distress (aPR: 1.83; 95% CI: 1.48-2.27) were associated with an increased prevalence of reporting barriers to accessing health services, whereas wage employment (aPR: 0.67; 95% CI: 0.49-0.90) was associated with decreased prevalence of reporting barriers to accessing health services. Overall, we found a high prevalence of psychological distress and interruptions in access to healthcare services 2 years into the pandemic across five sub-Saharan African countries. Increased effort and attention should be given to addressing the negative impacts of COVID-19 on psychological distress. An equitable and collaborative approach to new and existing preventive measures for COVID-19 is crucial to limit the consequences of COVID-19 on the health of adults in sub-Saharan Africa.

Continued disruptions in health care services and mental health among health care providers during the COVID-19 pandemic in five sub-Saharan African countries.

Background: Continuous monitoring of the pandemic's impact on health service provision and mental health, COVID-19 perceptions, and compliance with prevention measures among health care providers (HCPs) can help with mitigating the pandemic's negative effects. Methods: A computer-assisted telephone interviewing (CATI) survey was conducted among 1499 HCPs in Burkina Faso (Ouagadougou), Ethiopia (Addis Ababa), Nigeria (Lagos and Ibadan), Tanzania (Dar es Salaam), and Ghana (Kintampo). Self-reported mental health, perceptions of the COVID-19 pandemic, and prevention measures available in the workplace were assessed. HCPs' responses to questions regarding the impact of COVID-19 on nine essential health services were summed into a score; high service disruption was defined as a score higher than the total average score across all sites. Modified Poisson regression was used to identify potential factors related to high service disruption. Results: Overall, 26.9% of HCPs reported high service disruption, with considerable differences across sites (from 1.6% in Dar es Salaam to 45.0% in Addis Ababa). A considerable proportion of HCPs reported experiencing mild psychological distress (9.4%), anxiety (8.0%), and social avoidance or rejection (13.9%) due to their profession. Participants in Addis Ababa (absolute risk ratio (ARR) = 2.10; 95% confidence interval (CI) = 1.59-2.74), Lagos (ARR = 1.65; 95% CI = 1.24-2.17), and Kintampo (ARR = 2.61; 95% CI = 1.94-3.52) had a higher likelihood of reporting high service disruption compared to those in Ouagadougou. Reporting ever-testing for COVID-19 (ARR = 0.82; 95% CI = 0.69-0.97) and the presence of COVID-19 guidelines in the workplace (ARR = 0.63; 95% CI = 0.53-0.77) were both associated with lower reported health service disruption among HCPs. Conclusion: The COVID-19 pandemic continues to disrupt essential health services and present a challenge to HCPs' mental health, with important differences across countries and settings; interventions are needed to mitigate these negative effects of the pandemic.

Reported Barriers to Healthcare Access and Service Disruptions Caused by COVID-19 in Burkina Faso, Ethiopia, and Nigeria: A Telephone Survey.

The coronavirus disease 2019 (COVID-19) pandemic may have short-term and long-term impacts on health services across sub-Saharan African countries. A telephone survey in Burkina Faso, Ethiopia, and Nigeria was conducted to assess the effects of the pandemic on healthcare services from the perspectives of healthcare providers (HCPs) and community members. A total of 900 HCPs (300 from each country) and 1,797 adult community members (approximately 600 from each country) participated in the study. Adjusted risk ratios (ARRs) and 95% confidence intervals (CIs) were computed using modified Poisson regression. According to the HCPs, more than half (56%) of essential health services were affected. Child health services and HIV/surgical/other services had a slightly higher percentage of interruption (33%) compared with maternal health services (31%). A total of 21.8%, 19.3%, and 7.7% of the community members reported that their family members and themselves had difficulty accessing childcare services, maternal health, and other health services, respectively. Nurses had a lower risk of reporting high service interruptions than physicians (ARR, 0.85; 95% CI, 0.56-0.95). HCPs at private facilities (ARR, 0.71; 95% CI, 0.59-0.84) had a lower risk of reporting high service interruptions than those at governmental facilities. Health services in Nigeria were more likely to be interrupted than those in Burkina Faso (ARR, 1.38; 95% CI, 1.19-1.59). Health authorities should work with multiple stakeholders to ensure routine health services and identify novel and adaptive approaches to recover referral services, medical care, maternal and child health, family planning, immunization and health promotion, and prevention during the COVID-19 era.

Design and Field Methods of the ARISE Network COVID-19 Rapid Monitoring Survey.

The coronavirus disease 2019 (COVID-19) pandemic has significant health and economic ramifications across sub-Saharan Africa (SSA). Data regarding its far-reaching impacts are severely lacking, thereby hindering the development of evidence-based strategies to mitigate its direct and indirect health consequences. To address this need, the Africa Research, Implementation Science, and Education (ARISE) Network established a mobile survey platform in SSA to generate longitudinal data regarding knowledge, attitudes, and practices (KAP) related to COVID-19 prevention and management and to evaluate the impact of COVID-19 on health and socioeconomic domains. We conducted a baseline survey of 900 healthcare workers, 1,795 adolescents 10 to 19 years of age, and 1,797 adults 20 years or older at six urban and rural sites in Burkina Faso, Ethiopia, and Nigeria. Households were selected using sampling frames of existing Health and Demographic Surveillance Systems or national surveys when possible. Healthcare providers in urban areas were sampled using lists from professional associations. Data were collected through computer-assisted telephone interviews from July to November 2020. Consenting participants responded to surveys assessing KAP and the impact of the pandemic on nutrition, food security, healthcare access and utilization, lifestyle, and mental health. We found that mobile telephone surveys can be a rapid and reliable strategy for data collection during emergencies, but challenges exist with response rates. Maintaining accurate databases of telephone numbers and conducting brief baseline in-person visits can improve response rates. The challenges and lessons learned from this effort can inform future survey efforts during COVID-19 and other emergencies, as well as remote data collection in SSA in general.

Impact of COVID-19 on Nutrition, Food Security, and Dietary Diversity and Quality in Burkina Faso, Ethiopia and Nigeria.

Coronavirus disease 2019 (COVID-19) can have far-reaching consequences for developing countries through the combined effects of infection and mortality, and the mitigation measures that can impact food systems and diets. Using a mobile platform, this cross-sectional study evaluated the effect of COVID-19 on food prices and dietary quality for 1797 households in Nouna and Ouagadougou in Burkina Faso, Addis Ababa and Kersa in Ethiopia, and Lagos and Ibadan in Nigeria. We assessed the consumption of 20 food groups during the previous 7 days. The dietary diversity scores (DDS) and Prime Diet Quality Scores (PDQS) were used to assess dietary diversity and quality. We used generalized estimating equation (GEE) linear models to evaluate associations between price changes for staples, pulses, vegetables, fruits, and animal source foods (ASFs) with the DDS and PDQS PDQS. Most participants reported increasing prices of staples, pulses, fruits, vegetables and ASF, and ≥ 40% reported the decreased consumption of staples, legumes, and other vegetables and fruits. The DDS (except in Kersa and Ouagadougou) and PDQS were lower during the COVID-19 pandemic. Higher pulse prices were associated with lower DDS (estimate, -0.35; 95% confidence interval [CI], -0.74 to 0.03; P = 0.07) in the combined analysis and in Burkina Faso (estimate, -0.47; 95% CI, -0.82 to -0.11). Higher vegetable prices were positively associated with the DDS (estimate, 0.22; 95% CI, 0.08 to 0.37). Lower crop production (estimate, -0.54; 95% CI, -0.80 to -0.27) was associated with lower DDS. The price increases and worsening dietary diversity and quality call for social protection and other strategies to increase the availability and affordability of nutrient-rich foods during the COVID-19 pandemic and public health emergencies.

Sexual and reproductive health knowledge among adolescents in eight sites across sub-Saharan Africa.

OBJECTIVE: To examine knowledge of menstruation, HIV and STIs other than HIV across eight sites in SSA to develop effective programmatic interventions enabling adolescents to achieve positive SRH as their transition to adulthood. METHODS: We combine data from eight Health and Demographic Surveillance Sites across sub-Saharan Africa, from an adolescent-specific survey that included 7116 males and females age 10-19 years old. We provide pooled and site-specific estimates from multiple analytic models examining the how year-specific age, school attendance and work correlate with knowledge of menstruation, HIV knowledge and knowledge of sexually transmitted infections (STIs) other than HIV. RESULTS: Many adolescents lack knowledge of menstruation (37.3%, 95% CI 31.8, 43.1 do not know of menstruation) and STIs other than HIV (55.9%, 95% CI 50.4, 61.3 do not know of other STIs). In multivariate analysis, older age, being in school and wealth are significant positive correlates of STI knowledge. Older adolescent age, female sex and being in school are significant positive correlates of knowledge of menstruation. Knowledge of HIV is high (89.7%, 95% CI 8.3, 12.7 know of HIV) and relatively similar across adolescent age, sex, wealth and school and work attendance. CONCLUSION: Knowledge of HIV is widespread across adolescents in these communities in sub-Saharan Africa, but knowledge of other dimensions of sexual and reproductive health - menstruation and other STIs in this study - is lacking especially for early adolescents (10- to 14-year olds). The dissemination of more comprehensive sexual and reproductive health information is needed within these and similar communities in SSA to help adolescents gain insight on how to make their own decisions towards positive adolescent sexual and reproductive health and protect them from risks.

OBJECTIF: Examiner les connaissances sur la menstruation, le VIH et les IST autres que le VIH dans huit sites d'Afrique subsaharienne (ASS) afin d'élaborer des programmes d'interventions efficaces permettant aux adolescents d'obtenir une santé sexuelle et reproductive (SSR) positive lorsqu'ils passent à l'âge adulte. MÉTHODES: Nous combinons ici les données de huit sites de Surveillance Démographique et de Santé en Afrique subsaharienne, à partir d'une enquête spécifique réalisée auprès d'adolescents et comprenant 7.116 hommes et femmes âgés de 10 à 19 ans. Nous fournissons des estimations poolées et spécifiques à chaque site à partir de plusieurs modèles analytiques examinant la corrélation entre l'âge, la fréquentation scolaire et le travail, avec les connaissances sur la menstruation, sur le VIH et sur les IST autres que le VIH. RÉSULTATS: Beaucoup d'adolescents manquaient de connaissance sur les menstruations (37,3% ; IC95%: 31,8-43,1 ne connaissaient pas les menstruations) et les IST autres que le VIH (55,9% ; IC95%: 50,4-61,3 ne connaissent pas d'autres IST). Dans l'analyse multivariée, l'âge plus avancé, la fréquentation scolaire et la richesse sont des corrélats positifs significatifs des connaissances sur les IST. L'âge adolescent plus avancé, le sexe féminin et le fait d'être à l'école sont des corrélats positifs significatifs pour les connaissances sur la menstruation. Les connaissances sur le VIH sont élevées (89,7%, IC95%: 8,3-12,7 sont au courant du VIH) et relativement similaires selon les âges des adolescents, le sexe, la richesse et la fréquentation scolaire et le travail. CONCLUSION: Les connaissances sur le VIH semblent être répandues parmi les adolescents de ces communautés en Afrique subsaharienne, mais les connaissances sur les autres aspects de la santé sexuelle et reproductive - menstruations et autres IST dans cette étude - semblent faire défaut, en particulier chez les jeunes adolescents (âgés de 10 à 14 ans). La dissémination de telles informations plus complètes est nécessaire au sein de ces communautés et de communautés similaires en ASS afin d'aider les adolescents à comprendre comment prendre leurs propres décisions en matière de santé sexuelle et reproductive et de les protéger contre les risques.

Are out-of-school adolescents at higher risk of adverse health outcomes? Evidence from 9 diverse settings in sub-Saharan Africa.

OBJECTIVES: We analysed mutually comparable surveys on adolescent attitudes and behaviours from nine sites in seven sub-Saharan African countries, to determine the relationship between school enrolment and adolescent health outcomes. METHODS: Data from the Africa Research, Implementation Science, and Education Network cross-sectional adolescent health surveys were used to examine the associations of current school enrolment, self-reported general health and four major adolescent health domains: (i) sexual and reproductive health; (ii) nutrition and non-communicable diseases; (iii) mental health, violence and injury; and (iv) healthcare utilisation. We used multivariable Poisson regression models to calculate relative risk ratios with 95% confidence intervals (CI), controlling for demographic and socio-economic characteristics. We assessed heterogeneity by gender and study site. RESULTS: Across 7829 adolescents aged 10-19, 70.5% were in school at the time of interview. In-school adolescents were 14.3% more likely (95% CI: 6-22) to report that their life is going well; 51.2% less likely (95% CI: 45-67) to report ever having had sexual intercourse; 32.6% more likely (95% CI: 9-61) to report unmet need for health care; and 30.1% less likely (95% CI: 15-43) to report having visited a traditional healer. School enrolment was not significantly associated with malnutrition, low mood, violence or injury. Substantial heterogeneity was identified between genders for sexual and reproductive health, and in-school adolescents were particularly less likely to report adverse health outcomes in settings with high average school enrolment. CONCLUSIONS: School enrolment is strongly associated with sexual and reproductive health and healthcare utilisation outcomes across nine sites in sub-Saharan Africa. Keeping adolescents in school may improve key health outcomes, something that can be explored through future longitudinal, mixed-methods, and (quasi-)experimental studies.

OBJECTIFS: Nous avons analysé des enquêtes mutuellement comparables sur les attitudes et les comportements d'adolescents dans neuf sites dans sept pays d'Afrique subsaharienne, afin de déterminer la relation entre la scolarisation et les résultats de la santé des adolescents. MÉTHODES: Des données provenant d'enquêtes transversales sur la santé des adolescents menées par le Réseau Africain de Recherche, d'Implémentation, de Science et d'Education ont été utilisées pour examiner les associations existant entre la scolarisation, l'état de santé général autodéclaré et les quatre principaux domaines de la santé des adolescents: (i) santé sexuelle et reproductive ; (ii) nutrition et maladies non transmissibles; (iii) santé mentale, violence et blessures et (iv) utilisation des soins de santé. Nous avons utilisé des modèles de régression multivariée de Poisson pour calculer les rapports de risque relatifs avec des intervalles de confiance (IC) à 95%, en tenant compte des caractéristiques démographiques et socioéconomiques. Nous avons évalué l'hétérogénéité par sexe et par site d'étude. RÉSULTATS: Sur 7.829 adolescents âgés de 10 à 19 ans, 70,5% étaient à l'école au moment de l'enquête. Les adolescents scolarisés étaient 14,3% (IC95%: 6-22) plus susceptibles de déclarer que leur vie se passait bien, 51,2% (IC95%: 45-67) moins susceptibles de déclarer avoir déjà eu des rapports sexuels, 32,6% (IC95%: 39-91) plus susceptibles de signaler un besoin de soins de santé non satisfait et 30,1% (IC95%: 15-43) moins susceptibles de déclarer avoir rendu visite à un guérisseur traditionnel. La scolarisation n'était pas associée de manière significative à la malnutrition, à la mauvaise humeur, à la violence ou aux blessures. Une hétérogénéité substantielle a été identifiée entre les sexes pour la santé sexuelle et reproductive, et les adolescents scolarisés étaient particulièrement moins susceptibles de faire état de résultats défavorables pour la santé dans les milieux où la moyenne de scolarisation était élevée. CONCLUSIONS: La scolarisation est fortement associée aux résultats en matière de santé sexuelle et reproductive et d'utilisation des soins de santé dans neuf sites en Afrique subsaharienne. Garder les adolescents à l'école peut améliorer les principaux résultats de santé, ce qui peut être exploré dans le cadre de futures études longitudinales.

Factors associated with depressive symptoms and suicidal ideation and behaviours amongst sub-Saharan African adolescents aged 10-19 years: cross-sectional study.

OBJECTIVE: This study aimed to determine the burden of depression, suicidal ideation and suicidal behaviour amongst adolescents at sites in six sub-Saharan African countries and examine associated risk and protective factors. METHODS: Household-based cross-sectional study involving male and female adolescents ages 10-19 years. A total of 7,662 adolescents from eight sites in six countries participated in the survey. Three sites were urban: Dar es Salaam (Tanzania), Harar (Ethiopia) and Ibadan (Nigeria); five were rural: Dodoma (Tanzania), Iganga/Mayuge (Uganda), Kersa (Ethiopia), Ningo Prampram (Ghana) and Nouna (Burkina Faso). Log-binomials models were used to estimate relative risks and confidence intervals for factors associated with depression and suicidal behaviour. This was supplemented using log-Poisson models as needed. RESULTS: The prevalence of suicidal behaviour over the last 12 months ranged between 1.2% and 12.4% in the eight sites. Depressive symptoms and suicidal ideation/behaviours were associated with older age, female sex, food insecurity, poor access to health care and substance use. Depression was strongly associated with increased risk of suicidal behaviour at two sites where the multivariate model converged: Harar, Ethiopia (RR = 3.5, 95% CI 1.8, 7.0, P < 0.05) and Ibadan, Nigeria (RR = 3.7, 95% CI 2.2, 6.3, P < 0.0001). CONCLUSIONS: Depressive symptoms and suicidal behaviour are common amongst sub-Saharan African adolescents at these 8 sites. Most factors associated with depressive symptoms are modifiable and preventable. Routine screening for depressive symptoms in services frequented by adolescents in these and similar communities would be crucial in early detection and prompt intervention.

OBJECTIF: Cette étude visait à déterminer la charge de morbidité de la dépression, des idées suicidaires et du comportement suicidaire chez les adolescents sur des sites dans six pays d'Afrique subsaharienne et examiner les facteurs de risque et de protection associés. MÉTHODES: Etude transversale réalisée auprès des ménages sur des adolescents masculins et féminins âgés de 10 à 19 ans. 7.662 adolescents de huit sites dans six pays ont participé à l'enquête. Trois sites étaient en zones urbaines: Dar es Salaam (Tanzanie), Harar (Ethiopie) et Ibadan (Nigéria); cinq étaient en zones rurales: Dodoma (Tanzanie), Iganga/Mayuge (Ouganda), Kersa (Ethiopie), Ningo Prampram (Ghana) et Nouna (Burkina Faso). Des modèles de logarithme binomial ont été utilisés pour estimer les risques relatifs et les intervalles de confiance pour les facteurs associés à la dépression et au comportement suicidaire. Cela a été complété à l'aide de modèles log-Poisson lorsque nécessaire. RÉSULTATS: La prévalence des comportements suicidaires au cours des 12 derniers mois variait entre 1,2% et 12,4% dans les huit sites. Les symptômes dépressifs et les idées/comportements suicidaires étaient associés à l'âge plus avancé, au sexe féminin, à l'insécurité alimentaire, au faible accès aux soins de santé et à la toxicomanie. La dépression était fortement associée à un risque accru de comportement suicidaire sur deux sites où il y avait une convergence dans le modèle multivarié: Harar, en Ethiopie (RR = 3,5; IC95%: 1,8-7,0; P < 0,05) et Ibadan, au Nigéria (RR = 3,7; IC95%: 2,2-6,3; P < 0,0001). CONCLUSIONS: Les symptômes dépressifs et les comportements suicidaires sont fréquents chez les adolescents africains subsahariens de ces 8 sites. La plupart des facteurs associés aux symptômes dépressifs sont modifiables et évitables. Le dépistage de routine des symptômes dépressifs dans les services fréquentés par les adolescents dans ces communautés et dans des communautés similaires serait crucial pour la détection précoce et une intervention rapide.

Influence of seasonal variation on water quality in tropical water distribution system: is the disease burden significant?

Recent evidence shows that water distribution system (WDS) is a major risk factor in piped water supply system and the degree of contamination of water in WDS is usually influenced by seasonal variation. Risk assessment studies eliminate the effect of seasonality whenever annualized estimate of concentration of contaminants in water is used to determine the risk to health. In tropical climate where strong seasonal variation prevails, the excess risk during dry and hot season, above the annualized risk can be significant. This study investigates what impact seasonal adjustment may have on health improvement targets for WDS. Water quality data of two Nigerian water supply schemes were used to estimate the impact of WDS on water quality. Seasonal deviation from the annualized impact was quantified as the latent risk in disability-adjusted life years (DALYs). The hazards identified in both WDSs were cadmium and lead, and the estimated 95th-percentile risk of the metals, over the course of dry season was about 31-38%, and 1-3% higher than the estimated yearly average risk, respectively. Wilcoxon signed-rank test showed that the risk distributions during the dry season was significantly higher (p < 0.05) than the yearly average. The median latent risks (5th, 95th-percentiles), for both WDS were 0.014 (7.6 × 10(-3), 0.023) and 4.8 × 10(-3) (-, 7.6 × 10(-3)) DALYs/person/year for cadmium and 0.87 × 10(-3) (0, 0.1 × 10(-3)) and 0.16 × 10(-3) (0, 0.031 × 10(-3)) DALYs/person/year, respectively, for lead. These risks are substantially higher than the WHO limit (1 × 10(-6) DALYs/person/year). Therefore, to achieve effective health improvement target, mitigation measures should be planned and executed by season.