Fan Song, Sun Yan-Ming, Lu Hong-Yan, Ma Xiao-Yan, Yue Hai, Lu Li, He Xiong, Ma Wei, Li Xue-Feng, Xiao Yan, Ruan Yu-Hua, Shao Yi-Ming
National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China.
Zhonghua Liu Xing Bing Xue Za Zhi. 2011 May;32(5):473-6.
To understand the prevalence of and factors associated with unprotected anal intercourse (UAI) among men who have sex with men (MSM) in Beijing.
Five hundred MSM were recruited for a survey using Respondent Driven Sampling (RDS) method, from September to October in 2009. A computer-assisted, interviewer-administered questionnaire was used to gather information including demographics, sexual behaviors and condom use social norms (a scaled number). Variables were evaluated by using RDSAT and SAS software.
Mean age of the participants was 30.6 years, with 96.0% of them as Han ethnicity and 68.5% having had at least high school or higher education level. 72.8% of them were unmarried, with 61.7% of them identified themselves as homosexual, 61.2% had > 1 male partners in the past six months, and the prevalence of UAI was 42.0%. Significant bivariate predictors of UAI would include condom use social norms score, role for anal sex with male sex partner, number of male sexual partners in the past 6 months and amount of alcohol consumed. In multivariable analysis, UAI was associated with a higher condom use social norms score (AOR = 1.2, 95%CI: 1.1 - 1.3), receptive anal intercourse (AOR = 2.0, 95%CI: 1.3 - 3.2) and drinking alcohol more than 3 times per month in the past 12 months (AOR = 1.6, 95%CI: 1.1 - 2.5).
The prevalence of UAI was high in the MSM community in Beijing, suggesting that efforts should be targeting on how to make the condom use a social norm and being promoted.
了解北京市男男性行为者（MSM）中无保护肛交（UAI）的流行情况及其相关因素。
2009年9月至10月，采用应答驱动抽样（RDS）方法招募了500名MSM进行调查。使用计算机辅助、访员管理的问卷收集信息，包括人口统计学、性行为和避孕套使用社会规范（一个量表分数）。变量通过RDSAT和SAS软件进行评估。
参与者的平均年龄为30.6岁，其中96.0%为汉族，68.5%至少具有高中或更高学历。72.8%未婚，61.7%自我认同为同性恋，61.2%在过去六个月中有>1个男性伴侣，UAI的流行率为42.0%。UAI的显著双变量预测因素包括避孕套使用社会规范得分、与男性性伴侣肛交的角色、过去6个月男性性伴侣的数量和饮酒量。在多变量分析中，UAI与较高的避孕套使用社会规范得分（AOR = 1.2，95%CI：1.1 - 1.3）、接受肛交（AOR = 2.0，95%CI：1.3 - 3.2）以及过去12个月每月饮酒超过3次（AOR = 1.6，95%CI：1.1 - 2.5）相关。
北京市MSM群体中UAI的流行率较高，表明应致力于使避孕套使用成为一种社会规范并加以推广。
