title: Antecedents of adolescent initiation of sex, contraceptive use, and pregnancy.
abstract: OBJECTIVE
  To identify the most important antecedents associated with adolescent initiation of sex, contraceptive use, and pregnancy.
  
  
  METHODS
  Statistically significant antecedents in more than 250 studies were identified and summarized.
  
  
  RESULTS
  More than 100 antecedents create a complex and detailed picture of the correlates of adolescent sexual behaviors. They describe characteristics of the adolescents themselves, their partners, peers, families, schools, and communities, as well as relationships to these entities. They included antecedents that were inherently sexual and nonsexual.
  
  
  CONCLUSIONS
  To reduce teen pregnancy substantially, multiple sexual and nonsexual antecedents in different clusters may need to be addressed.
authors.affiliation: ETR Associates, Santa Cruz, CA, 95061-1830, USA. dougk@etr.org
authors.forename: Douglas
authors.initials: D
authors.lastname: Kirby
mesh_terms: D000293:Adolescent; D000328:Adult; D003268:Contraception Behavior; D005260:Female; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D008297:Male; D011247:Pregnancy; D011253:Pregnancy in Adolescence / Q000517:prevention & control* / Q000523:psychology; D012307:Risk Factors; D012725:Sexual Behavior; D012924:Social Conditions; D012931:Social Environment; D014481:United States