Shift of childbirth to younger mothers, and its effect on the incidence of mongolism in Victoria, Australia, 1939-1964.
D000293:Adolescent; D000328:Adult; D001315:Australia; D001723:Birth Rate; D004314:Down Syndrome / Q000453:epidemiology* / Q000401:mortality; D004739:England; D005260:Female; D006801:Humans; D008423:Maternal Age; D011336:Probability; D014852:Wales