Background
Studies of alcohol use and sexual behavior in African populations have primarily been cross-sectional, used non-validated measures of alcohol use, or relied on self-reported sexual risk endpoints. Few have focused on HIV-positive women.
Methods
Longitudinal data were collected from a cohort of HIV-positive Kenyan female sex workers. At enrollment and annual visits, participants were asked about past-year alcohol use using the Alcohol Use Disorders Identification Test (AUDIT). The primary endpoint was detection of prostate-specific antigen (PSA) in vaginal secretions at quarterly examinations. Associations between hazardous/harmful alcohol use (AUDIT score ≥7), PSA detection, and secondary measures of sexual risk were evaluated using generalized estimating equations with a log binomial regression model.
Results
A total of 405 women contributed 2,750 vaginal samples over 606 person-years of follow-up. Hazardous/harmful alcohol use was reported at 16.6% of AUDIT assessments, and was associated with higher risk of PSA detection (relative risk [RR] 1.50; 95% confidence interval [CI] 1.11–2.01) relative to no alcohol use. This association was attenuated, and no longer statistically significant, after adjusting for age, work venue, intimate partner violence, depression, and partnership status (adjusted RR [aRR] 1.13; 95% CI 0.82–1.56). In exploratory analyses, alcohol use was associated with self-report of unprotected sex and with STI acquisition.
Conclusions
Although hazardous/harmful alcohol use was not associated with detection of PSA in adjusted analysis, associations with secondary outcomes suggest that alcohol use is at least a marker of sexual risk behavior.