title: Association of Situational and Environmental Factors With Last Episode of Unprotected Anal Intercourse Among MSM in Hong Kong: A Case-Crossover Analysis.
abstract: This study investigates event-specific factors that differentiate the last episodes of unprotected anal intercourse (UAI) from protected anal intercourse (PAI) with regular partner (RP) among 213 men who have sex with men (MSM) who did not use condoms consistently using case-crossover analysis. Factors positively associated with the last episode of UAI with RP included: two situational factors (i.e., participant's suggestion to have UAI, alcohol use) and three environmental/setting factors (i.e., sex took place overseas, during a weekday and not at home). Negative associations with an episode of UAI with RP included: five situational factors (i.e., discussion about condom use prior to sex, RP's suggestion to have PAI, participant's suggestion to have PAI, perception that RP would like to use a condom, participant's planning to use a condom) and two environmental/setting factors (i.e., condoms placed at the venue where sex took place, partner possessed a condom). Thus, these significant event-specific factors explained under which circumstances some MSM would use and would not use condoms during anal sex with RP.
authors.affiliation: Centre for Health Behaviours Research, Faculty of Medicine, The School of Public Health and Primary Care, The Chinese University of Hong Kong, Shatin, Hong Kong.|The Chinese University of Hong Kong Shenzhen Research Institute, Shatin, Hong Kong.|Centre for Medical Anthropology and Behavioral Health, Sun Yat-sen University, Guangzhou, China.
authors.forename: Joseph T F
authors.initials: JT
authors.lastname: Lau
authors.affiliation: Centre for Health Behaviours Research, Faculty of Medicine, The School of Public Health and Primary Care, The Chinese University of Hong Kong, Shatin, Hong Kong.|The Chinese University of Hong Kong Shenzhen Research Institute, Shatin, Hong Kong.
authors.forename: Phoenix K H
authors.initials: PK
authors.lastname: Mo
authors.affiliation: Department of Medical Statistics and Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Gu
authors.affiliation: Department of Medical Statistics and Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou, China.
authors.forename: Chun
authors.initials: C
authors.lastname: Hao
authors.affiliation: Centre for Health Behaviours Research, Faculty of Medicine, The School of Public Health and Primary Care, The Chinese University of Hong Kong, Shatin, Hong Kong.
authors.forename: CoCo H Y
authors.initials: CH
authors.lastname: Lai
mesh_terms: D000328:Adult; D000428:Alcohol Drinking; D017280:Condoms / Q000706:statistics & numerical data*; D018592:Cross-Over Studies; D015658:HIV Infections / Q000517:prevention & control*; D007722:Health Knowledge, Attitudes, Practice; D018451:Homosexuality, Male; D006723:Hong Kong / Q000453:epidemiology; D006801:Humans; D008297:Male; D010465:Perception; D015995:Prevalence; D012307:Risk Factors; D012309:Risk-Taking; D012725:Sexual Behavior; D012747:Sexual Partners / Q000523:psychology*; D012931:Social Environment; D047568:Unsafe Sex / Q000517:prevention & control / Q000523:psychology / Q000706:statistics & numerical data*