title: Hormonal contraception and risk of bacterial vaginosis diagnosis in an observational study of women attending STD clinics in Baltimore, MD.
abstract: BACKGROUND
  The protective effect of hormonal contraception may offer a potential intervention against bacterial vaginosis (BV).
  
  
  METHODS
  Three hundred thirty reproductive-age women enrolled in a contraceptive program from April 2005 to October 2006 at two sexually transmitted diseases clinics in Baltimore, MD. Participants were supplied with hormonal contraceptives of their choice and followed prospectively. BV was diagnosed by Amsel's criteria. Results from population-level analysis were compared to a case-crossover analysis.
  
  
  RESULTS
  BV was diagnosed in 189 (13.0%) of the visits among 133 (40.3%) women. In the population-level analysis, the use of progestin-only and combined contraception was associated with a decreased risk of BV compared to intervals of no hormonal contraceptive use [adjusted odds ratio (AOR): 0.42 (95% CI: 0.20-0.88) and AOR: 0.66 (95% CI: 0.39-1.10), respectively]. The case-crossover analysis demonstrated a similar trend in findings.
  
  
  CONCLUSIONS
  Hormonal contraception was associated with a decreased risk of BV in an STD clinic cohort.
authors.affiliation: Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA.
authors.forename: Samara B
authors.initials: SB
authors.lastname: Rifkin
authors.forename: Marsha R
authors.initials: MR
authors.lastname: Smith
authors.forename: Rebecca M
authors.initials: RM
authors.lastname: Brotman
authors.forename: Renee M
authors.initials: RM
authors.lastname: Gindi
authors.forename: Emily J
authors.initials: EJ
authors.lastname: Erbelding
mesh_terms: D000328:Adult; D000554:Ambulatory Care Facilities; D015142:Baltimore; D003277:Contraceptives, Oral, Combined / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D011372:Progestins / Q000627:therapeutic use*; D011446:Prospective Studies; D018570:Risk Assessment; D016585:Vaginosis, Bacterial / Q000175:diagnosis / Q000517:prevention & control*; D055815:Young Adult
chemical_list: D003277:Contraceptives, Oral, Combined; D011372:Progestins