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Sustainable Development Goals
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USING MODEL-BASED GEOSTATISTICS FOR ASSESSING THE ELIMINATION OF TRACHOMA
Author
Sasanami, Misaki
Amoah, Benjamin
Diori, Adam Nouhou
Amza, Abdou
Souley, Abdoul Salam Youssoufou
Bakhtiari, Ana
Kadri, Boubacar
Szwarcwald, Célia L.
Gomez, Daniela Vaz Ferreira
Almou, Ibrahim
Lopes, Maria de Fátima Costa
Masika, Michael P.
Beidou, Nassirou
Boyd, Sarah
Harding-Esch, Emma M.
Solomon, Anthony W.
Giorgi, Emanuele
Amoah, Benjamin
Diori, Adam Nouhou
Amza, Abdou
Souley, Abdoul Salam Youssoufou
Bakhtiari, Ana
Kadri, Boubacar
Szwarcwald, Célia L.
Gomez, Daniela Vaz Ferreira
Almou, Ibrahim
Lopes, Maria de Fátima Costa
Masika, Michael P.
Beidou, Nassirou
Boyd, Sarah
Harding-Esch, Emma M.
Solomon, Anthony W.
Giorgi, Emanuele
Affilliation
Lancaster University. Lancaster Medical School. Lancaster, United Kingdom.
Imperial College London. School of Public Health. Faculty of Medicine. London, United Kingdom.
Ophtalmologie de l'Hôpital Amirou Boubacar Diallo de Niamey. Niamey, Niger.
Abdou Moumouni University of Niamey. Faculty of Health Sciences. Niamey, Niger.
Ophtalmologie de l'Hôpital Amirou Boubacar Diallo de Niamey. Niamey, Niger.
Task Force for Global Health. International Trachoma Initiative. Decatur, Georgia, United States of America.
Programme National de Sante Oculaire. Niamey, Niger.
Fundação Oswaldo Cruz. Instituto de Comunicação e Informação Científica e Tecnológica em Saúde. Rio de Janeiro, RJ, Brasil.
Ministry of Health. Secretariat of Health and Environmental Surveillance. Brasília, DF, Brazil.
Programme National de Sante Oculaire. Niamey, Niger.
Ministry of Health. Secretariat of Health and Environmental Surveillance. Brasília, DF, Brazil.
Ministry of Health. Lilongwe, Malawi.
National Blindness Prevention Program. Niamey, Niger.
ask Force for Global Health. International Trachoma Initiative. Decatur, Georgia, United States of America.
London School of Hygiene & Tropical Medicine. Faculty of Infectious and Tropical Diseases. Clinical Research Department. London, United Kingdom.
World Health Organization. Global Neglected Tropical Diseases Programme. Geneva, Switzerland.
Lancaster University. Lancaster Medical School. Lancaster, United Kingdom.
Imperial College London. School of Public Health. Faculty of Medicine. London, United Kingdom.
Ophtalmologie de l'Hôpital Amirou Boubacar Diallo de Niamey. Niamey, Niger.
Abdou Moumouni University of Niamey. Faculty of Health Sciences. Niamey, Niger.
Ophtalmologie de l'Hôpital Amirou Boubacar Diallo de Niamey. Niamey, Niger.
Task Force for Global Health. International Trachoma Initiative. Decatur, Georgia, United States of America.
Programme National de Sante Oculaire. Niamey, Niger.
Fundação Oswaldo Cruz. Instituto de Comunicação e Informação Científica e Tecnológica em Saúde. Rio de Janeiro, RJ, Brasil.
Ministry of Health. Secretariat of Health and Environmental Surveillance. Brasília, DF, Brazil.
Programme National de Sante Oculaire. Niamey, Niger.
Ministry of Health. Secretariat of Health and Environmental Surveillance. Brasília, DF, Brazil.
Ministry of Health. Lilongwe, Malawi.
National Blindness Prevention Program. Niamey, Niger.
ask Force for Global Health. International Trachoma Initiative. Decatur, Georgia, United States of America.
London School of Hygiene & Tropical Medicine. Faculty of Infectious and Tropical Diseases. Clinical Research Department. London, United Kingdom.
World Health Organization. Global Neglected Tropical Diseases Programme. Geneva, Switzerland.
Lancaster University. Lancaster Medical School. Lancaster, United Kingdom.
Abstract
Background Trachoma is the commonest infectious cause of blindness worldwide. Efforts are being made to eliminate trachoma as a public health problem lobally. However, as prevalence decreases, it becomes more challenging to precisely predict prevalence. We demonstrate how model-based geostatistics (MBG) can be used as a reliable, efficient, and widely applicable tool to assess the elimination status of trachoma. Methods We analysed trachoma surveillance data from razil, Malawi, and Niger. We developed geostatistical Binomial models to predict trachomatous inflammation—follicular (TF) and trachomatous trichiasis (TT) prevalence. We proposed a general framework to incorporate age and gender in the geostatistical models, whilst accounting for residual spatial and nonspatial variation in prevalence through the use of random effects. We also used predictive probabilities generated by the geostatistical models to quantify the likelihood of having achieved the elimination target in each evaluation unit (EU). Results TF and TT prevalence varied considerably by country, with Brazil showing the lowest prevalence and Niger the highest. Brazil and Malawi are highly likely to have met the elimination criteria for TF in each EU, but, for some EUs, there was high uncertainty in relation to the elimination of TT according to the model alone. In Niger, the predicted prevalence varied significantly across EUs, with the probability of having achieved the elimination target ranging from values close to 0% to 100%, for both TF and TT. Conclusions We demonstrated the wide applicability of MBG for trachoma programmes, using data from different epidemiological settings. Unlike the standard trachoma prevalence survey approach, MBG provides a more statistically rigorous way of quantifying uncertainty around the achievement of elimination prevalence targets, through the use of spatial correlation. In addition to the analysis of existing survey data, MBG also provides an approach to identify areas in which more sampling effort is needed to improve EU classification. We advocate MBG as the new standard method for analysing trachoma survey outputs.
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