Maternal mortality surveillance, 1974-1978.
D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D008423:Maternal Age; D008428:Maternal Mortality; D008875:Middle Aged; D011247:Pregnancy; D011248:Pregnancy Complications / Q000401:mortality; D018566:Pregnancy, High-Risk; D012306:Risk; D014481:United States