深圳市基于移动互联网交友的MSM肛交性行为特征及相关研究

目的 了解基于移动互联网的男男性行为者（MSM）肛交性行为特点及影响要素,为疾病的防治提供依据。方法 2017年1月—2018年12月,在MSM聚集的移动互联网社交平台上,选择18周岁以上,最近1年内有过肛交同性性行为的男性810人为调查对象,分析肛交性行为特征及影响因素。结果 最近6个月MSM人群同性肛交性行为比例为82.1%（665/810）,HIV感染率为18.1%（147/810）;无保护肛交的比例为45.6%（303/665）,HIV感染率为26.1%（79/303）;最近6个月与无保护肛交有影响的因素有：已婚（OR=0.938, 95%CI:0.642~0.971）、获得同伴教育（OR=0.376, 95%CI:0.262~0.539）,居住时间>6~12个月（OR=0.276, 95%CI:0.120~0.634）、居住时间>12~24个月（OR=0.544, 95%CI:0.292~0.743）、居住时间24个月以上（OR=0.347, 95%CI:0.256~0.767）、感染性病（OR=0.401, 95%CI:0.201~0.800）、知晓艾滋病防治相关知识（OR=0.443, 95%CI:0.104~0.773）。结论 MSM无保护性肛交发生比例高,虽然婚姻对无保护性肛交有制约作用,但艾滋病健康促进至关重要;基于互联网抽样和干预是MSM艾滋病流行病学研究和控制的有效途径。

Anal intercourse sexual behavior characteristics and related factors of men who have sex with men based on mobile internet in Shenzhen

Objective To understand the anal intercourse sexual behavior characteristics and its influencing factors of internet-based men who have sex with men（MSM）, so as to provide basis for intervention and control aiming at unprotected anal intercourse sexual behavior. Methods The 810 participants who were older than 18 years and had anal intercourse with men last year, were recruited from the friendship platforms of mobile internet for MSM in Shenzhen, from January 2017 to December 2018. The anal intercourse sexual behavior characteristics and related factors were analyzed by unconditional logistic regression models. Results Among them, the proportion of homosexual anal intercourse was 82.1%(665/810) in recent 6 months, and the total HIV infection rate was 18.1%(147/810). The proportion of unprotected anal intercourse was 45.6%(303/665), and the infection rate in this group was 26.1%(79/303). Multiple logistic regression analysis revealed that the factors negatively associated with unprotected anal sex in the last 6 months were married (OR=0.938, 95%CI: 0.642~0.971), obtained peer education (OR=0.376, 95%CI: 0.262-0.539), and lived more than 6-12 months (OR=0.276, 95%CI: 0.120~0.634), residence time more than 12-24 months (OR=0.544, 95%CI: 0.292~0.743), residence time more than 24 months (OR=0.347, 95%CI: 0.256~0.767), infectious diseases (OR=0.401, 95%CI: 0.201-0.800), knowledge of AIDS prevention and control(OR=0.443, 95%CI: 0.104-0.773). Conclusions There was a high proportion of unprotected anal intercourse which was restricted by married status in MSM population. According to this study, we have found that AIDS health proportion is very important. We also found that internet-based sampling and intervention is an effective way to study and control AIDS epidemiology in MSM population.