title: [Comparative analysis on both high risk behaviours, infection of HIV and syphilis between married and unmarried men who have sex with men].
abstract: OBJECTIVE
  To understand the distribution of marriage status among men who have sex with men (MSM) in the city of Changzhou, and to explore the impact of marriage on AIDS related high risk behaviors and HIV infection in this population.
  
  
  METHODS
  Target sampling (snowball sampling) was adopted to carry out a cross-sectional study, and structured questionnaire-based interviews were conducted to collect information on social demography, HIV related high risk behaviors. Blood and urine samples were collected to detect HIV, syphilis, gonorrhea and Chlamydia trachomatis infections.
  
  
  RESULTS
  Of the 655 participants, 37.4% were married. Married MSM mostly sought their sexual partners at the public bathing house (61.6%), while unmarried MSM were mainly through bars (33.6%) or internet (31.1%). The proportion of having anal sex with men during the last 6 months was lower in the married group (50.8%) than in the unmarried group (73.3%), (P < 0.001) The percentage of having sex with women in the last 6 months was significantly higher in the married group (68.9%) than that in the unmarried group (33.2%) (P < 0.001), (OR = 4.454, 95%CI: 3.168 - 6.261). The rates of condom use in the last anal sex with men in married and unmarried groups were 71.0% and 77.6%, respectively (P = 0.152). The rate of condom use in the last intercourse with women was significantly lower in the married group (44.0%) than that in the unmarried group (70.4%) (P < 0.001), (OR = 0.331, 95%CI: 0.205 - 0.535). In the sex trade, most of the married MSM would "buy" sex (66.7%), while unmarried MSM would "sell" sex (63.2%) (P < 0.05), (OR = 3.429, 95%CI: 1.255 - 9.366). The percentage of having drugs in the previous year was higher in married group (3.3%) than that in the unmarried group (0.8%) (P < 0.05). In married and unmarried groups, the infection rates of HIV, syphilis, gonorrhea and Chlamydia trachomatis appeared to be (8.6%, 8.6%), (17.1%, 12.3%), (1.6%, 2.4%), and (3.3%, 9.0%), respectively (P > 0.05).
  
  
  CONCLUSIONS
  Marriage seemed to have had limited effects on reducing the high risk behaviors of MSM. Different and multiform interventions should be developed according to the different characteristics of married or unmarried MSM population.
authors: Changzhou Center for Disease Control and Prevention, Changzhou, China.
authors: Yan-li
authors: YL
authors: Guo
authors: Jian-bo
authors: JB
authors: Zhou
authors: Chao
authors: C
authors: Hao
authors: Xi-ping
authors: XP
authors: Huan
authors: Tai-ping
authors: TP
authors: Shi
authors: Jin-ta
authors: JT
authors: Wang
authors: Sen
authors: S
authors: Zhen
authors: Yue-ping
authors: YP
authors: Yin
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology*; D000293:Adolescent; D000328:Adult; D000368:Aged; D003430:Cross-Sectional Studies; D018451:Homosexuality, Male; D006801:Humans; D008297:Male; D017533:Marital Status; D008875:Middle Aged; D012309:Risk-Taking; D011795:Surveys and Questionnaires; D047568:Unsafe Sex; D055815:Young Adult