A study of premarital pregnancy.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001719:Birth Certificates; D004522:Educational Status; D005006:Ethnicity; D005260:Female; D005306:Fertilization; D005865:Gestational Age; D006801:Humans; D007086:Illegitimacy; D008393:Marriage; D011247:Pregnancy; D013997:Time Factors; D014798:Vital Statistics; D014861:Washington