Risk factors for high risk sexual behaviors.

High risk sexual behavior was defined as sex with a casual or commercial sex partner without using condom consistently *The variables of P-value ≤0.1 were listed in this table by the univariate analysis. P-values ≤0.05 were considered statistically significant finally by multiple logistic regression analysis. **Odds ratio was derived from the univariate analysis without controlling for potential confounders. ***Odds ratio was adjusted for other variables listed in this table by multiple logistic regression analysis. CI = confidence interval.