title: Adolescents' contraceptive use and pregnancy history: is there a pattern?
abstract: OBJECTIVE
  To examine the association between pregnancy experience and adolescents' contraceptive use.
  
  
  METHODS
  We conducted a retrospective study of 920 sexually active adolescents not desiring pregnancy. Adjusted multivariable logistic regression analyses were used to assess the explanatory value of previous birth and abortion as well as first pregnancy at presentation on contraceptive practice.
  
  
  RESULTS
  Twenty-seven percent of the adolescents had been pregnant. Regardless of pregnancy history, 52% of adolescents used noneffective contraception (ie, condoms inconsistently or no method). Adolescents with previous abortion were three times (odds ratio [OR] 3.4, 95% confidence interval [CI] 1.6, 7.3) more likely than never-pregnant adolescents to use hormonal contraception. However, although more likely to use contraceptive injections or implants, adolescent mothers were not more likely than never-pregnant adolescents to use oral contraceptives. Adolescents with prior abortion or birth were less than half (ORs 0.3 and 0.4, 95% CIs 0.2, 0.5 and 0.2, 0.6, respectively) as likely as never-pregnant adolescents to use condoms consistently.
  
  
  CONCLUSIONS
  Previous pregnancy is associated with increased likelihood to use hormonal methods; however, a significant proportion of adolescents use noneffective methods and, thus, are at risk for repeat teenage pregnancies.
authors.affiliation: Department of Obstetrics, Gynecology, and Reproductive Sciences, Center for Reproductive Health Research and Policy, University of California, San Francisco, CA, USA.
authors.forename: Maarit
authors.initials: M
authors.lastname: Paukku
authors.forename: Judy
authors.initials: J
authors.lastname: Quan
authors.forename: Philip
authors.initials: P
authors.lastname: Darney
authors.forename: Tina
authors.initials: T
authors.lastname: Raine
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D000328:Adult; D000367:Age Factors; D002140:California / Q000453:epidemiology; D002648:Child; D003267:Contraception / Q000706:statistics & numerical data*; D003270:Contraceptive Agents / Q000145:classification; D005260:Female; D006801:Humans; D016015:Logistic Models; D008499:Medical Records; D016017:Odds Ratio; D011247:Pregnancy; D011253:Pregnancy in Adolescence / Q000706:statistics & numerical data*; D012189:Retrospective Studies
chemical_list: D003270:Contraceptive Agents