HIV prevalence by demographic characteristics and sexual behaviors among MSM in Guangzhou, 2008–2013.

aPearson chi-square test.bLikelihood ratio chi-square test.cUAI, unprotected anal intercourse; UVI, unprotected vaginal intercourse; STI, sexually transmitted infection.a. 皮尔逊卡方检验（Pearson chi-square test）。b. 似然比卡方检验（Likelihood ratio chi-square test）。c. UAI：无保护肛交（unprotected anal intercourse）；UVI：无保护阴道性交（unprotected vaginal intercourse）；STI：性传播感染（sexually transmitted infection）。