This report investigates the impact of potential misclassification of samples on HIV prevalence estimates for 23 surveys conducted from 2010-2014. In addition to visual inspection of laboratory results, we examined how accounting for potential misclassification of HIV status through Bayesian latent ...class models affected the prevalence estimates. Two types of Bayesian models were specified: a model that only uses the individual dichotomous test results and a continuous model that uses the quantitative information of the EIA (i.e., the signal-to-cutoff values). Overall, we found that adjusted prevalence estimates matched the surveys’ original results, with overlapping uncertainty intervals. This suggested that misclassification of HIV status should not affect the prevalence estimates in most surveys. However, our analyses suggested that two surveys may be problematic. The prevalence could have been overestimated in the Uganda AIDS Indicator Survey 2011 and the Zambia Demographic and Health Survey 2013-14, although the magnitude of overestimation remains difficult to ascertain. Interpreting results from the Uganda survey is difficult because of the lack of internal quality control and potential violation of the multivariate normality assumption of the continuous Bayesian latent class model. In conclusion, despite the limitations of our latent class models, our analyses suggest that prevalence estimates from most of the surveys reviewed are not affected by sample misclassification.
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As part of an ongoing effort to promote disability-inclusive humanitarian action in Pacific countries, this policy brief identifies priority actions for disaster readiness, response and recovery. It has been prepared through a collaborative approach and should be a key reference in the future, promo...ting coordination across all levels and stages of the humanitarian cycle in the Region.
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This flipbook, released in Nov. 2011, contains key messages that pregnant women and their families need in order to plan care of an infant at home right after birth. It focuses on essential actions families can take both to prevent newborn death and illness and to promote healthy newborn development....
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