The results of HIV infection by logistic regression analysis.

Variables with P<0.2 in the univariate analysis, such as ages, marital status, duration of homosexual behavior, number of male sex partners in past 6 months and commercial sexual behavior, were retained in the final multivariate logistic model in a forward stepwise manner. Finally, three Variables such as protected sex, commercial sexual behavior and duration of homosexual behavior entered in the multivariate logistic model.