SynthesisAmerican journal of epidemiology2020
Estimating the Intracluster Correlation Coefficient for the Clinical Sign "Trachomatous Inflammation-Follicular" in Population-Based Trachoma Prevalence Surveys: Results From a Meta-Regression Analysis of 261 Standardized Preintervention Surveys Carried Out in Ethiopia, Mozambique, and Nigeria.
Synthesis in American journal of epidemiology, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers.
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19 citing papers in PubMed.
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- Discrepancy Between Active Trachoma and Tests of Chlamydial Infection in Alto Amazonas, Peru.Clinical infectious diseases : an official publication of the Infectious Diseases Society of America · 2026Article
- Does persistent active trachoma mandate antibiotic mass drug administration? A comparison of prevalence of trachomatous inflammation-follicular with that of conjunctival infection and anti-chlamydial antibodies, Western Province, Zambia.International health · 2026Article
- Prevalence and associations of trachoma before interventions in six departments of the Colombian Amazon and Orinoquía.PloS one · 2026Article
- Impact of trachoma elimination efforts in afar regional state, Ethiopia: survey findings from 26 evaluation units.BMC infectious diseases · 2025Article
- Trachoma Impact Survey Results from 31 Woredas in Tigray Region, Ethiopia.Ophthalmic epidemiology · 2024Article
- Progress Towards Elimination of Trachoma in Kenya 2017-2020.Ophthalmic epidemiology · 2024Article
- Twenty-Three Population-Based Trachoma Prevalence Surveys in the Central and Northern Regions of Benin, 2018-2022.Ophthalmic epidemiology · 2024Article
- Prevalence of Trachoma in Four Evaluation Units in Yemen after Implementation of Trachoma Elimination Measures.Ophthalmic epidemiology · 2024Article
- High prevalence of trachomatous inflammation-follicular with no trachomatous trichiasis: can alternative indicators explain the epidemiology of trachoma in Côte d'Ivoire?International health · 2023Article
- Prevalence of trachoma in Somali region, Ethiopia: results from trachoma impact surveys in 50 woredas.International health · 2023Article
- Tropical Data: Approach and Methodology as Applied to Trachoma Prevalence Surveys.Ophthalmic epidemiology · 2023Article
- Baseline Prevalence of Trachoma in Refugee Settlements in Uganda: Results of 11 Population-based Surveys.Ophthalmic epidemiology · 2023Article
- Prevalence of Trachoma in Pre-validation Surveillance Surveys in 11 Evaluation Units (Covering 12 Districts) in Oromia Regional State, Ethiopia: Results from 2018-2020.Ophthalmic epidemiology · 2023Article
- Prevalence of Trachoma after Implementation of Trachoma Elimination Interventions in Oromia Regional State, Ethiopia: Results of Impact Surveys in 131 Evaluation Units Covering 139 Districts.Ophthalmic epidemiology · 2023Article
- Mapping the risk of Rift Valley fever in Uganda using national seroprevalence data from cattle, sheep and goats.PLoS neglected tropical diseases · 2023Article
- A multi-level analysis of prevalence and factors associated with caesarean section in Nigeria.PLOS global public health · 2023Article
- Multi-level predictors of sexual autonomy among married women in Nigeria.BMC women's health · 2022Article
- Multilevel Analysis of Urban-Rural Variations of Body Weights and Individual-Level Factors among Women of Childbearing Age in Nigeria and South Africa: A Cross-Sectional Survey.International journal of environmental research and public health · 2021Article
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Abstract
Sample sizes in cluster surveys must be greater than those in surveys using simple random sampling in order to obtain similarly precise prevalence estimates, because results from subjects examined in the same cluster cannot be assumed to be independent. Therefore, a crucial aspect of cluster sampling is estimation of the intracluster correlation coefficient (ρ): the degree of relatedness of outcomes in a given cluster, defined as the proportion of total variance accounted for by between-cluster variation. In infectious disease epidemiology, this coefficient is related to transmission patterns and the natural history of infection; its value also depends on particulars of survey design. Estimation of ρ is often difficult due to the lack of comparable survey data with which to calculate summary estimates. Here we use a parametric bootstrap model to estimate ρ for the ocular clinical sign "trachomatous inflammation-follicular" (TF) among children aged 1-9 years within population-based trachoma prevalence surveys. We present results from a meta-regression analysis of data from 261 such surveys completed using standardized methods in Ethiopia, Mozambique, and Nigeria in 2012-2015. Consistent with the underlying theory, we found that ρ increased with increasing overall TF prevalence and smaller numbers of children examined per cluster. Estimates of ρ for TF were independently higher in Ethiopia than in the other countries.
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