Risk factors for HIV infection: odds ratios (ORs) for selected biological factors.

NOTE: OR: odds ratio; CI: confidence interval; HSV2: herpes simplex virus 2; p: pvalue from likelihood-ratio test; pt: pvalue from likelihood -ratio test for linear trend; NA: not applicable.aAdjusted for age, occupation, marital status, number of lifetime partners, reported genital ulcers during past year, HSV-2 infection, Neisseria gonorrhoea.bAdjusted for age, religion, occupation, marital status, length of time slept away past year, HIV knowledge, ever used condom, number of lifetime partners, number of lifetime pregnancies, ever had blood transfusion past 5 yrs, reported genital ulcers during past year, HSV2 infection.