title: Nonnegligible increasing temporal trends in unprotected anal intercourse among men who have sexual relations with other men in montreal.
abstract: OBJECTIVE
  To determine temporal trends in unprotected anal intercourse (UAI) among men who have sex with men (MSM) participating in the Omega Cohort Study, 1997 through 2003.
  
  
  METHODS
  The Omega Cohort Study was a longitudinal study of HIV-negative MSM aged 16 years or older and living in Montreal. Participants completed self-administered questionnaires and interviews every 6 months. Trend analysis using the generalized estimating equation was done for length of cohort membership (visits) and by calendar time for all visits per type of sexual partner. Odds ratios (ORs) were calculated to measure the odds of increasing UAI per 6-month period.
  
  
  RESULTS
  Among subjects who were followed for at least 4 years, UAI increased with regular seroconcordant partners (OR = 1.06, 95% confidence interval [CI]: 1.04 to 1.09) and any type of partner (OR = 1.05, 95% CI: 1.03 to 1.07). There was a nonnegligible increase in UAI with casual partners (OR = 1.05, 95% CI: 1.01 to 1.09). For the analysis by calendar time, there were increases in UAI between regular seroconcordant partners (OR = 1.04, 95% CI: 1.02 to 1.05) and any type of partner (OR = 1.03, 95% CI: 1.02 to 1.04). There were nonnegligible increases in UAI with casual partners (OR = 1.03, 95% CI: 1.00 to 1.05) and with any type of partner except a regular seroconcordant partner from 15.7% to 18.8% (OR = 1.02, 95% CI: 1.00 to 1.04).
  
  
  CONCLUSIONS
  There was a nonnegligible and consistent increase in UAI among Omega Cohort Study participants between 1997 and 2003. Continuous trend analysis is important because it allows us to follow UAI closely and to implement intervention strategies that may help to stop or reduce the present trend.
authors.affiliation: Mental Health Services, St. Michael's Hospital, Toronto, Ontario, Canada.
authors.forename: Clemon
authors.initials: C
authors.lastname: George
authors.forename: Michel
authors.initials: M
authors.lastname: Alary
authors.forename: Joanne
authors.initials: J
authors.lastname: Otis
authors.forename: Eric
authors.initials: E
authors.lastname: Demers
authors.forename: Robert S
authors.initials: RS
authors.lastname: Remis
authors.forename: Benoît
authors.initials: B
authors.lastname: Mâsse
authors.forename: René
authors.initials: R
authors.lastname: Lavoie
authors.forename: Jean
authors.initials: J
authors.lastname: Vincelette
authors.forename: Raymond
authors.initials: R
authors.lastname: Parent
authors.forename: Roger
authors.initials: R
authors.lastname: Leclerc
authors.forename: Bruno
authors.initials: B
authors.lastname: Turmel
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D018451:Homosexuality, Male / Q000706:statistics & numerical data*; D006801:Humans; D007407:Interviews as Topic; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D011792:Quebec; D012725:Sexual Behavior / Q000706:statistics & numerical data*; D011795:Surveys and Questionnaires; D047568:Unsafe Sex / Q000706:statistics & numerical data*