title: Event-specific risk factors predicting episodes of unprotected anal intercourse with male nonregular partners among men who have sex with men using case-crossover study design.
abstract: This study investigated event-specific factors that determine episodes of unprotected and protected anal intercourse (UAI and PAI) among 215 men who have sex with men (MSM), who used condoms inconsistently with nonregular partners (NRP) in the last six months, in Hong Kong. A case-crossover study design was used. Lower likelihood of episodes involving UAI with NRP was associated with (1) five partner attributes (NRP were <35 years old, at least three previous anal sex experiences with the NRP, perception that participant and the NRP had asymmetrical sexual experience, perception that the NRP was feminine, and liking toward the NRP; OR = 0.16-0.52), (2) six situational variables (the participant having had UAI with another man in the last week, having discussed condom use, perception that the NRP liked to use condom, partner's suggestion to have PAI, participant's suggestion to have PAI, and participant's plan to use condoms; OR = 0.11-0.39), and (3) four environmental/setting variables (condoms already placed at the venue, display of condom use promotion materials, participant's possession of a condom, and the NRP possessed a condom; OR = 0.27-0.45). HIV prevention targeting MSM should focus on event-specific protective factors, which may be different from those obtained from studies distinguishing condom users versus nonusers.
authors.affiliation: School of Public Health and Primary Care, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong.
authors.forename: Jinghua
authors.initials: J
authors.lastname: Li
authors.affiliation: School of Public Health and Primary Care, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong ; CUHK Shenzhen Research Institute, Shenzhen 518057, China ; Centre for Medical Anthropology and Behavioral Health, Sun Yat-sen University, Guangzhou 510080, China ; Centre for Health Behaviors Research, School of Public Health and Primary Care, Faculty of Medicine, The Chinese University of Hong Kong, 5/F., School of Public Health, Prince of Wales Hospital, Shatin, New Territories, Hong Kong.
authors.forename: Joseph T F
authors.initials: JT
authors.lastname: Lau
authors.affiliation: School of Public Health, Sun Yat-sen University, Guangzhou 510080, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Gu
authors.affiliation: School of Public Health, Sun Yat-sen University, Guangzhou 510080, China.
authors.forename: Chun
authors.initials: C
authors.lastname: Hao
authors.affiliation: School of Public Health and Primary Care, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong.
authors.forename: Coco H Y
authors.initials: CH
authors.lastname: Lai
mesh_terms: D000293:Adolescent; D000328:Adult; D016022:Case-Control Studies; D018451:Homosexuality, Male; D006723:Hong Kong / Q000453:epidemiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D012307:Risk Factors; D012309:Risk-Taking; D047568:Unsafe Sex