| Objective1. To describe the knowledge and behavior related to sexually transmitted diseases/AIDS of men who have sex with men (MSM) in Wuhan city.2. To grip infected condition about HIV, syphilis and HCV in Wuhan MSM.3. To find out the feasibility, advantages and disadvantages of respondent driven sampling (RDS) when the method is applied in hidden populations.Method1. We have some qualitative investigations such as reviewing literature and talking to key men who know the inside story in order to understand related conditions of target population, including the composing and seize of MSM social network, their accessibility and confirmation of different seeds.2. We collect samples by RDS and have a face-to-face questionnaire survey to men who are accordant with demands, then draw 5 ml blood to detective HIV, syphilis and HCV antibody.3. RDSAT software is used to analyze data. It will evaluate the balance of sample, and have point and interval estimation to population composing and seize. Logistic Regression is used to compare ratios.Result1. MSM in Wuhan city know AIDS prevention and cure knowledge to some extent. We evaluate that 77.7%(70.3%～82.1%) MSM in population had anal sex in the latest 6 months, and only 45.2%(36.4%～50.2%) among them used condom every sexual behavior. The proportion of buying and selling sex in the latest 6 months is 4.5%(3.4%～7.6%), 12.6%(7.5%～16.2%) respectively. 22.6%(18.0%～27.3%) MSM had sex with at least one girl in the latest 6 months.2. Of all 456 MSM who detected blood, 22 are HIV positive. 98 are syphilis positive and 11 are HCV positive. It is estimated that positive rate of HIV, syphilis and HCV in population is 6.5%(3.3%～9.7%), 21.9%(16.9%～26.9%), 2.4%(0.6%～4.2%), respectively.3. After recruitment, sample's basic characteristics get a balance between 5 and 8 waves. Calculate the mean absolute difference between actual sample composing and theoretical balancing composing. It turns out that the mean absolute differences of all characteristic groups are less than 2%.Conclusion1. MSM in Wuhan city have a separation of knowledge and behavior. Some of them have sex with both men and women, and unsafe sexual behavior is frequent. It indicates that previous interventions are superficial, which cannot radically enforce their consciousness to prevent AIDS.2. MSM in Wuhan city have a high infected rate in HIV and syphilis. And it is possible these diseases will spread into general population. It shows that MSM should be regarded as one of intensive groups in preventing and controlling AIDS.3. RDS can successfully recruit a sample with devise demographic characteristics from few seeds. The sample will get a balance after a few waves of recruitment. However, it is still have some disadvantages. For example, it takes long time to recruit MSM, and workload of investigators is large. Besides, it cannot directly evaluate the effectiveness of sample. |
PDF Full Text Request