Illegitimacy and Down's syndrome.
D000293:Adolescent; D000328:Adult; D000368:Aged; D001719:Birth Certificates; D001723:Birth Rate; D003075:Coitus; D004314:Down Syndrome / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007086:Illegitimacy; D008404:Massachusetts; D008423:Maternal Age; D008875:Middle Aged