Hormonal contraception and risk of bacterial vaginosis diagnosis in an observational study of women attending STD clinics in Baltimore, MD.
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.
Rifkin
Samara B
SB
Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA.
Smith
Marsha R
MR
Brotman
Rebecca M
RM
Gindi
Renee M
RM
Erbelding
Emily J
EJ
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
D003277:Contraceptives, Oral, Combined; D011372:Progestins