Smoking and prematurity in the presence of other variables.
D000293:Adolescent; D000328:Adult; D001741:Black or African American; D001724:Birth Weight; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D008875:Middle Aged; D011247:Pregnancy; D012723:Sex; D012907:Smoking; D013223:Statistics as Topic