Factors influencing the outcome of labour in the Nigerian primigravidae.
D000293:Adolescent; D000328:Adult; D005260:Female; D006257:Head / Q000196:embryology; D006801:Humans; D007743:Labor, Obstetric; D008423:Maternal Age; D008875:Middle Aged; D009549:Nigeria; D010387:Pelvimetry; D011247:Pregnancy; D011446:Prospective Studies