Correcting for selection bias in HIV prevalence estimates: an application of sample selection models using data from population-based HIV surveys in seven sub-Saharan African countries
Introduction Population-based biomarker surveys are the gold standard for estimating HIV prevalence but are susceptible to substantial non-participation (up to 30%). Analytical missing data methods, including inverse-probability weighting (IPW) and multiple imputation (MI), are biased when data are...
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
05 August 2022
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| In: |
Journal of the International AIDS Society
Year: 2022, Volume: 25, Issue: 8, Pages: 1-10 |
| ISSN: | 1758-2652 |
| DOI: | 10.1002/jia2.25954 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1002/jia2.25954 Verlag, lizenzpflichtig, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/jia2.25954 
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| Author Notes: | Anton M. Palma, Giampiero Marra, Rachel Bray, Suzue Saito, Anna Colletar Awor, Mohamed F. Jalloh, Alexander Kailembo, Wilford Kirungi, George S. Mgomella, Prosper Njau, Andrew C. Voetsch, Jennifer A. Ward, Till Bärnighausen and Guy Harling |
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| 245 | 1 | 0 | |a Correcting for selection bias in HIV prevalence estimates |b an application of sample selection models using data from population-based HIV surveys in seven sub-Saharan African countries |c Anton M. Palma, Giampiero Marra, Rachel Bray, Suzue Saito, Anna Colletar Awor, Mohamed F. Jalloh, Alexander Kailembo, Wilford Kirungi, George S. Mgomella, Prosper Njau, Andrew C. Voetsch, Jennifer A. Ward, Till Bärnighausen and Guy Harling |
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| 520 | |a Introduction Population-based biomarker surveys are the gold standard for estimating HIV prevalence but are susceptible to substantial non-participation (up to 30%). Analytical missing data methods, including inverse-probability weighting (IPW) and multiple imputation (MI), are biased when data are missing-not-at-random, for example when people living with HIV more frequently decline participation. Heckman-type selection models can, under certain assumptions, recover unbiased prevalence estimates in such scenarios. Methods We pooled data from 142,706 participants aged 15-49 years from nationally representative cross-sectional Population-based HIV Impact Assessments in seven countries in sub-Saharan Africa, conducted between 2015 and 2018 in Tanzania, Uganda, Malawi, Zambia, Zimbabwe, Lesotho and Eswatini. We compared sex-stratified HIV prevalence estimates from unadjusted, IPW, MI and selection models, controlling for household and individual-level predictors of non-participation, and assessed the sensitivity of selection models to the copula function specifying the correlation between study participation and HIV status. Results In total, 84.1% of participants provided a blood sample to determine HIV serostatus (range: 76% in Malawi to 95% in Uganda). HIV prevalence estimates from selection models diverged from IPW and MI models by up to 5% in Lesotho, without substantial precision loss. In Tanzania, the IPW model yielded lower HIV prevalence estimates among males than the best-fitting copula selection model (3.8% vs. 7.9%). Conclusions We demonstrate how HIV prevalence estimates from selection models can differ from those obtained under missing-at-random assumptions. Further benefits include exploration of plausible relationships between participation and outcome. While selection models require additional assumptions and careful specification, they are an important tool for triangulating prevalence estimates in surveys with substantial missing data due to non-participation. | ||
| 650 | 4 | |a HIV prevalence | |
| 650 | 4 | |a missing data | |
| 650 | 4 | |a non-participation | |
| 650 | 4 | |a population surveys | |
| 650 | 4 | |a selection models | |
| 650 | 4 | |a surveillance | |
| 700 | 1 | |a Marra, Giampiero |e VerfasserIn |4 aut | |
| 700 | 1 | |a Bray, Rachel |e VerfasserIn |4 aut | |
| 700 | 1 | |a Saito, Suzue |e VerfasserIn |4 aut | |
| 700 | 1 | |a Awor, Anna Colletar |e VerfasserIn |4 aut | |
| 700 | 1 | |a Jalloh, Mohamed F. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Kailembo, Alexander |e VerfasserIn |4 aut | |
| 700 | 1 | |a Kirungi, Wilford |e VerfasserIn |4 aut | |
| 700 | 1 | |a Mgomella, George S. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Njau, Prosper |e VerfasserIn |4 aut | |
| 700 | 1 | |a Voetsch, Andrew C. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Ward, Jennifer A. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Bärnighausen, Till |d 1969- |e VerfasserIn |0 (DE-588)120262029 |0 (DE-627)080560512 |0 (DE-576)178470848 |4 aut | |
| 700 | 1 | |a Harling, Guy |e VerfasserIn |4 aut | |
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