Trends in cesarean section deliveries, Canada, 1968-1977.
D000293:Adolescent; D000328:Adult; D001946:Breech Presentation; D002170:Canada; D002585:Cesarean Section / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D008423:Maternal Age; D010298:Parity; D011247:Pregnancy