Using Factor Analyses to Estimate the Number of Female Sex Workers across Malawi from Multiple Regional Sources

Citation

Niu, Xiaoyue Maggie; Rao, Amrita; Chen, David; Sheng, Ben; Weir, Sharon S.; Umar, Eric; Trapence, Gift; Jumbe, Vincent; Kamba, Dunker; & Rucinski, Katherine B., et al. (2021). Using Factor Analyses to Estimate the Number of Female Sex Workers across Malawi from Multiple Regional Sources. Annals of Epidemiology, 55, 34-40. PMCID: PMC7901797

Abstract

PURPOSE: Human immunodeficiency virus (HIV) risks are heterogeneous in nature even in generalized epidemics. However, data are often missing for those at highest risk of HIV, including female sex workers. Statistical models may be used to address data gaps where direct, empiric estimates do not exist.
METHODS: We proposed a new size estimation method that combines multiple data sources (the Malawi Biological and Behavioral Surveillance Survey, the Priorities for Local AIDS Control Efforts study, and the Malawi Demographic Household Survey). We used factor analysis to extract information from auxiliary variables and constructed a linear mixed effects model for predicting population size for all districts of Malawi.
RESULTS: On average, the predicted proportion of female sex workers among women of reproductive age across all districts was about 0.58%. The estimated proportions seemed reasonable in comparing with a recent study Priorities for Local AIDS Control Efforts II (PLACE II). Compared with using a single data source, we observed increased precision and better geographic coverage.
CONCLUSIONS: We illustrate how size estimates from different data sources may be combined for prediction. Applying this approach to other subpopulations in Malawi and to countries where size estimate data are lacking can ultimately inform national modeling processes and estimate the distribution of risks and priorities for HIV prevention and treatment programs.

URL

http://dx.doi.org/10.1016/j.annepidem.2020.12.001

Reference Type

Journal Article

Year Published

2021

Journal Title

Annals of Epidemiology

Author(s)

Niu, Xiaoyue Maggie
Rao, Amrita
Chen, David
Sheng, Ben
Weir, Sharon S.
Umar, Eric
Trapence, Gift
Jumbe, Vincent
Kamba, Dunker
Rucinski, Katherine B.
Viswasam, Nikita
Baral, Stefan D.
Bao, Le

Article Type

Regular

PMCID

PMC7901797

Data Set/Study

Malawi Biological and Behavioral Surveillance Survey (BBSS)
Priorities for Local AIDS Control Efforts (PLACE) Study
Malawi Demographic Household Survey

Continent/Country

Malawi

State

Nonspecific

Sex/Gender

Women

ORCiD

Weir - 0000-0001-6014-1460