Evaluation of geospatial methods to generate subnational HIV prevalence estimates for local level planning

Timothy Hallett, Sarah-Jane Anderson, Cynthia Adobea Asante, Noah Bartlett, Victoria Bendaud, Samir Bhatt, Clara Burgert, Diego Fernando Cuadros, Janet Dzangare, Daniela Fecht, Peter William Gething, Peter Ghys, James Guwani, Nathan Heard, Ezekiel Kalipeni, Ngianga-Bakwin Kandala, Andrea A. Kim, Isiah Doe Kwao, Joseph Larmarange, Samuel MandaImelda Moise, Livia Montana, Daniel Mwai, Samuel Mwalili, Ashton Shortridge, Frank Tanser, Ian Wanyeki, Leo Zulu

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)
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Abstract

Objective: There is evidence of substantial subnational variation in the HIV epidemic. However, robust spatial HIV data are often only available at high levels of geographic aggregation and not at the finer resolution needed for decision making. Therefore, spatial analysis methods that leverage available data to provide local estimates of HIV prevalence may be useful. Such methods exist but have not been formally compared when applied to HIV. Design/methods: Six candidate methods - including those used by UNAIDS to generate maps and a Bayesian geostatistical approach applied to other diseases- were used to generate maps and subnational estimates of HIV prevalence across three countries using cluster level data from household surveys. Two approaches were used to assess the accuracy of predictions: (1) internal validation, whereby a proportion of input data is held back (test dataset) to challenge predictions, (2) comparison with location specific data from household surveys in earlier years. Results: Each of the methods can generate usefully accurate predictions of prevalence at unsampled locations, with the magnitude of the error in predictions similar across approaches. However, the Bayesian geostatistical approach consistently gave marginally the strongest statistical performance across countries and validation procedures. Conclusions: Available methods may be able to furnish estimates of HIV prevalence at finer spatial scales than the data currently allow. The subnational variation revealed can be integrated into planning to ensure responsiveness to the spatial features of the epidemic. The Bayesian geostatistical approach is a promising strategy for integrating HIV data to generate robust local estimates.
Original languageEnglish
Pages (from-to)1467-1474
JournalAIDS
Volume30
Issue number9
DOIs
Publication statusPublished - 1 Jun 2016

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