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Non-response bias in estimates of HIV prevalence due to the mobility of absentees in national population-based surveys: a study of nine national surveys.

Abstract：

OBJECTIVES:To measure the bias in national estimates of HIV prevalence in population-based surveys caused by mobility and refusal to test. METHODS:Data from nine demographic and health surveys and AIDS indicator surveys were used. Non-responders were divided into three groups: (i) "refusals" who were interviewed but not tested; (ii) "refusals" who were present in the household but not interviewed or tested; and (iii) "absentees" who were absent from the household. Correction for HIV status was made for the non-responders using multiple imputation methods with logistic regression models based on a common set of household-level and individual-level sociodemographic and behavioural factors for those tested and stratified by mobility status. RESULTS:The non-response groups were corrected to have higher risks of HIV than those who participated in the HIV tests, although these were only detected to be statistically significant in some of the countries. In Lesotho, the corrected prevalence for the absent household members was significantly higher than for those who were present in the household. However, the adjusted prevalences differed by less than a percentage point from the prevalences observed among those who were tested, so the overall effects of non-response on national estimates of HIV prevalence are minimal. CONCLUSIONS:The results indicate that the mobility of absentees does not substantially bias estimates of HIV prevalence from population-based surveys. None the less, if levels of non-response are high or if non-responders differ greatly from those who participate in HIV testing with respect to HIV status, non-response could still bias national estimates of HIV prevalence.

journal_name

Sex Transm Infect

journal_title

Sexually transmitted infections

authors

Marston M,Harriss K,Slaymaker E

doi

10.1136/sti.2008.030353

subject

Has Abstract

pub_date

2008-08-01 00:00:00

pages

i71-i77

eissn

1368-4973

issn

1472-3263

pii

84/Suppl_1/i71

journal_volume

84 Suppl 1

pub_type

杂志文章,多中心研究

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Non-response bias in estimates of HIV prevalence due to the mobility of absentees in national population-based surveys: a study of nine national surveys.