Table 4.
Associations Among Exposure to Anal Intercourse and HIV Prevalence and Reports of Sexually Transmitted Infection Diagnosis in the Past 12 Months in a Cross-Sectional Sample of Female Sex Workers, Abidjan, Côte d’Ivoire, 2014
| Outcome and Anal Intercourse Frequency | Sample Size | Unmatched Regressionsa | Matched Regressionsa,b | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Univariate | Multivariablec | Matched | aPR | 95% CI | |||||
| PR | 95% CI | aPR | 95%CI | AI | No AI | ||||
| HIV prevalence | |||||||||
| AI during normal week | 451 | 0.38 | 0.14, 1.01 | 0.46 | 0.23, 0.95 | 85 | 63 | 0.41 | 0.13, 1.25 |
| AI during past month | 438 | 0.51 | 0.22, 1.18 | 0.79 | 0.42, 1.48 | 94 | 69 | 1.18 | 0.48, 2.89 |
| AI during past year | 451 | 0.67 | 0.33, 1.35 | 0.77 | 0.42, 1.41 | 100 | 75 | 1.08 | 0.43, 2.70 |
| Diagnosed with an STId by a doctor or health worker in the past 12 months | |||||||||
| AI during normal week | 462 | 1.28 | 0.82, 2.02 | 0.93 | 0.58, 1.49 | 84 | 63 | 1.07 | 0.58, 1.95 |
| AI during past month | 448 | 1.10 | 0.69, 1.76 | 0.79 | 0.48, 1.29 | 95 | 68 | 0.97 | 0.52, 1.79 |
| AI during past year | 462 | 1.09 | 0.70, 1.72 | 0.85 | 0.54, 1.34 | 99 | 75 | 0.99 | 0.54, 1.81 |
Abbreviations: AI. anal intercourse; aPR, adjusted prevalence ratio; CI, confidence interval; PR, prevalence ratio; STI, sexually transmitted infection.
a Poisson regression model with robust/clustered standard errors were used. Estimates were adjusted for clustering of standard errors by recruiter identification (respondent-driven sampling weights were not incorporated).
b Women who reported having AI were matched using a nearest-neighbor matching algorithm based on minimizing the Mahalanobis distance to the following covariates: age, time since first paid sex, weekly number of sexual partners, weekly income from sex work, consistent condom use during past year for VI, country of birth, marital status, having sex with clients in public places, and having consumed more than 6 alcoholic drinks on 1 occasion every week or more often.
c Multivariable models were adjusted for the following covariates: age (natural spline with 2 degrees of freedom), time since first paid sex (natural spline with 2 degrees of freedom), weekly number of sexual partners (natural spline with 2 degrees of freedom), weekly income from sex work (natural spline with 2 degrees of freedom), consistent condom use during past year for VI, country of birth (Côte d’Ivoire vs. other), marital status (married vs. other), having sex with clients in public spaces, and having consumed more than 6 alcoholic drinks on 1 occasion every week or more often.
d Includes syphilis, gonorrhea, chlamydia, herpes, human papillomavirus, hepatitis B, and hepatitis C, among others.