Tang Hou-lin, Lü Fan, Zhang Da-peng, Wu Yu-hua, Zhang Jie
National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 100050, China.
Zhonghua Yu Fang Yi Xue Za Zhi. 2009 Nov;43(11):965-9.
To identify the characteristics of the sexual networks and HIV/AIDS related high-risk behaviors among MSM in Harbin city, and to evaluate the possibility of HIV transmission among MSM and from MSM to general population.
A face to face questionnaire investigation was conducted among 673 MSM aged above 18 years older from May to July, 2006 in Harbin, Heilongjiang province. The Key-informant sampling and time-location sampling methods were used at different sites to recruit objectives, including bars, bathrooms, parks and social networks.Mixing matrices were computed based on the demographic characteristics of MSM and their sexual partners. Sexual networks analysis by egocentric methods, such as network size, density and sexual mixing patterns.
A total of 647 questionnaires were completed. The number of them recruited from bars, bathrooms, parks and social networks were 229, 291, 36 and 91. The average size of sexual networks was 14 persons, the least network density was 0.14. The proportion of having sexual relationship in the past year was 30.5% (647/2123). Of which recruited at bars, bathrooms, parks and social networks, the proportions of having long-term relationship with their sex partners were 22.8% (159/699), 35.9% (329/917), 26.4% (28/106) and 32.7% (131/401), respectively. There was statistical significance in MSM having sexual relationship with their partners at different recruited places (chi(2) = 34.07, P < 0.01). Sexual networks of MSM from public bathroom was larger with an average number of 18. Only 35.9% (329/917) of them had long-term relationship with their sex partners. A tendency for age and marriage pairing to cluster around main diagonal suggesting that MSM were similar to choosing sexual partners in the respect of age and marriage status. The proportions of consistent condom use in the past 6 months were 40.9% (647/2123).
MSM from different sites have greatly different sexual networks characteristics. Sexual mixing patterns are weakly assertive in the MSM and potential of HIV spread among MSM exists.
了解哈尔滨市男男性行为者（MSM）性网络特征及艾滋病相关高危行为，评估MSM人群内部及MSM人群与一般人群间艾滋病传播的可能性。
2006年5 - 7月，在黑龙江省哈尔滨市对673名18岁以上MSM进行面对面问卷调查。采用关键人物抽样和时间 - 地点抽样方法，在酒吧、浴室、公园及社交网络等不同场所招募对象。根据MSM及其性伴的人口学特征计算混合矩阵。采用以个体为中心的方法进行性网络分析，如网络规模、密度及性混合模式。
共完成有效问卷647份。从酒吧、浴室、公园及社交网络招募的人数分别为229、291、36和91人。性网络平均规模为14人，最小网络密度为0.14。过去一年有性行为的比例为30.5%（647/2123）。其中，从酒吧、浴室、公园及社交网络招募的对象中，与性伴保持长期关系的比例分别为为22.8%（159/699）、35.9%（329/917）、26.4%（(28/106)和32.7%（131/401）。不同招募场所的MSM与性伴发生性行为情况有统计学意义（χ² = 34.07，P < 0.01）。来自公共浴室的MSM性网络规模较大平均人数为18人。其中只有35.9%（329/917）与性伴保持长期关系。年龄和婚姻配对倾向于聚集在主对角线附近，提示MSM在年龄和婚姻状况方面选择性伴具有相似性。过去6个月坚持使用避孕套的比例为40.9%（647/2123）。
不同场所的MSM性网络特征差异较大。MSM中性混合模式较弱，存在艾滋病传播风险。
