• Journal Article

Are Hormonal Contraceptive Users More Likely to Misreport Unprotected Sex? Evidence From a Biomarker Validation Study in Zimbabwe

Citation

McCoy, S. I., Ralph, L. J., Padian, N. S., & Minnis, A. (2014). Are Hormonal Contraceptive Users More Likely to Misreport Unprotected Sex? Evidence From a Biomarker Validation Study in Zimbabwe. AIDS and Behavior, 18(12), 2259-2264. DOI: 10.1007/s10461-014-0741-z

Abstract

We analyzed biomarker validation data of unprotected sex from women in Zimbabwe to determine whether condom and sexual behavior misreporting differs between users of different contraceptive methods. Self-reported sexual behavior was compared with the presence of prostate-specific antigen (PSA) in vaginal fluid, a biomarker of semen exposure. Of the 195 women who were PSA positive, 94 (48 %) reported no sex or only condom-protected sex. Hormonal contraceptive users misreported sexual behavior less than women using non-hormonal methods (45 vs. 67 %, P = 0.03). This misclassification pattern could have implications on the elevated risk of HIV infection associated with hormonal contraception in some studies