The social ecology of obstetrical competence.
D001724:Birth Weight; D005006:Ethnicity; D005260:Female; D006801:Humans; D007086:Illegitimacy; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D008423:Maternal Age; D008824:Michigan; D007744:Obstetric Labor Complications / Q000523:psychology*; D010298:Parity; D011247:Pregnancy; D011248:Pregnancy Complications / Q000523:psychology*; D011295:Prenatal Care / Q000523:psychology; D012737:Sex Factors; D012923:Social Class; D012931:Social Environment; D012959:Socioeconomic Factors