title: Reasons for nonuse of contraception by sexually active women aged 15--19.
mesh_terms: D000293:Adolescent; D000328:Adult; D003268:Contraception Behavior; D005260:Female; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D012252:Natural Family Planning Methods; D011247:Pregnancy; D011253:Pregnancy in Adolescence; D011275:Pregnancy, Unwanted