title: Factors associated with unprotected anal intercourse and age among men who have sex with men who are gay bar customers in Osaka, Japan.
abstract: BACKGROUND
  HIV infections among men who have sex with men (MSM) are increasing in Japan.
  
  
  METHODS
  An anonymous self-administered questionnaire among clients of a gay bar in Osaka was used to analyse the relationship between age and unprotected anal sex (UAI).
  
  
  RESULTS
  The highest rate of UAI was reported among those aged ≥45 (73.3%), followed by the ≤24 (60.7%), 25-34 (56.3%) and 35-44 (54.0%) age groups (P=0.01). In multivariate analysis, UAI was related to sex with six or more sexual partners among those aged ≤24 (adjusted odds ratio (AOR), 4.88; confidence interval (CI), 1.21-19.74), bisexual identity (AOR, 2.47; CI, 1.06-5.76) and drug use (AOR, 0.49; CI, 0.26-0.93 for no drug use) in the 25-34 age group, and no lifetime HIV testing in the 35-44 age group (AOR, 2.57; CI, 1.40-4.74). Condom purchasing and condom carrying were protective of UAI in 25-34, 35-44 and ≥45 age groups.
  
  
  CONCLUSIONS
  Programs promoting condom use are needed for younger and older MSM.
authors.affiliation: Department of Communicable Disease Epidemiology and Control, Nagoya City University, Nagoya, Aichi, Japan. koerner-tky@umin.ac.jp
authors.forename: Jane
authors.initials: J
authors.lastname: Koerner
authors.forename: Satoshi
authors.initials: S
authors.lastname: Shiono
authors.forename: Seiichi
authors.initials: S
authors.lastname: Ichikawa
authors.forename: Noriyo
authors.initials: N
authors.lastname: Kaneko
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Tsuji
authors.forename: Toshio
authors.initials: T
authors.lastname: Machi
authors.forename: Daisuke
authors.initials: D
authors.lastname: Goto
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Onitsuka
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001003:Anal Canal; D001727:Bisexuality; D016009:Chi-Square Distribution; D015658:HIV Infections / Q000453:epidemiology / Q000635:transmission*; D018451:Homosexuality, Male; D006801:Humans; D007564:Japan / Q000453:epidemiology; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D012307:Risk Factors; D012725:Sexual Behavior; D012749:Sexually Transmitted Diseases / Q000453:epidemiology / Q000635:transmission*