title: Risk factors for early sexual activity and early unplanned pregnancy.
authors.forename: S
authors.initials: S
authors.lastname: Panzarine
authors.forename: J
authors.initials: J
authors.lastname: Santelli
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D003268:Contraception Behavior; D005190:Family; D005260:Female; D006801:Humans; D011247:Pregnancy; D011253:Pregnancy in Adolescence; D012307:Risk Factors; D012725:Sexual Behavior; D012931:Social Environment; D014481:United States