几种抽样方法在社区暗娼人群艾滋病调查中的应用

Study on thea application of several sampling methods in HIV/AIDS surveyamong female sex workers

目的探讨几种抽样方法在社区暗娼人群中应用的可行性和有效性,为开展暗娼人群艾滋病监测提供抽样方法的依据。方法在广东省采用滚雪球法、同伴推动抽样法和时间空间抽样法分别对暗娼人群进行抽样,比较其招募效率和所得样本的社会人口学特征。结果 3种抽样方法在招募效率上差异不大。同伴推动抽样法和时间空间抽样法对中低档暗娼人群的招募较滚雪球法有效,滚雪球法偏倚较大。同伴推动抽样法更易招募到站街暗娼等隐蔽人群。结论社区暗娼人群的监测应采用同伴推动抽样法或时间空间抽样法等概率性抽样方法。。

Objective To study the feasibility and efficiency of three sampling methods among community female sex workers, and provide scientific basis on sampling method for future HIV/AIDS surveillance. Methods Snow-ball sampiing, respondent-driven sampling, and time-location sampling were used to recruit community female sex workers in Guangdong Province. The recruitment efficiency and the social and demographic characteristics among the samples were compared. Results There were no significant difference in the recruitment efficiency between snow-ball sampling, respondent-driven sampling, and time-location sampling. Respondent driven sampling and time location sampling were more effective to recruit those from the female sex workers of the middle and lower class. Snow-ball sampling resulted in more se- lection bias. Respondent driven sampling could reach more hidden population such as street-based female sex workers. Conclusions The HIV/AIDS surveillance among female sex workers should consider the probability sampling method, such as respondent driven sampling or time location sampling method.