Feasibility of RDS, Effectiveness of Risk-Reduction-Counseling and Testing, and Factors Associated with Loss-to-Follow-Up in an Intervention Study for Men Who Have Sex with Men in Nanjing

摘要: Background: Respondent-driven-sampling (RDS) has been recognized as a method for sampling from most hard-to-reach populations. Meanwhile, loss to follow up of the participants in studies usually reduces validity association measured observational studies, and this problem cannot be overcame through data analysis.Methods: In cross sectional study Nanjing city Jiangsu province China, 430 MSM were recruited including 9 seeds 14 weeks period using RDS. Information regarding socio-demographic characteristics sexual risk behavior collected testing was done HIV syphilis. Duration, completion, participant equilibrium key factors used assessing feasibility All negative followed at 6, 12 18 months evaluate behavioral changes after counseling reduce behaviors. Logistic regression performed identify correlated with up.Results: sample, adjusted syphilis prevalence 6.6% 14.6% respectively, whereas incidence 5.2 per 100 person-years. The 3.8 during six months, 1.1 months. Although there tendency recruitment within same self-identified group, considerable cross-group also seen. During period, reported unprotected anal intercourse (UAI) significantly decreased 60.9% 42.9%. proportion who had one or no partner increased 40.9% 48.0%. found that some behaviors between baseline by slight increase addition, associated younger age, small social network, lower education, non-official residence Jiangsu.Conclusion: RDS potential efficient feasible recruiting diverse sample reasonable time. Reductions UAI can achieved testing, but may wane over loss-to-follow-up our helpful retention rate future cohort studies.