Pregnancy risk factor assessment--north area of Santiago, Chile, 1982-1983.
D000293:Adolescent; D000328:Adult; D002677:Chile; D004522:Educational Status; D005260:Female; D006801:Humans; D009790:Occupations; D011247:Pregnancy; D011248:Pregnancy Complications / Q000453:epidemiology* / Q000209:etiology; D012306:Risk; D014505:Urban Population