Contraceptive failure in the United States.
D000328:Adult; D000367:Age Factors; D044383:Black People; D003267:Contraception / Q000379:methods*; D004522:Educational Status; D005260:Female; D006801:Humans; D008297:Male; D008393:Marriage; D011247:Pregnancy; D011275:Pregnancy, Unwanted; D012067:Religion; D013997:Time Factors; D014481:United States; D044465:White People; D001741:Black or African American