Intellectual performance, race, and socioeconomic status.
D000293:Adolescent; D000328:Adult; D001741:Black or African American; D002648:Child; D002675:Child, Preschool; D005006:Ethnicity; D005260:Female; D006801:Humans; D007361:Intelligence Tests; D008297:Male; D008396:Maryland; D010414:Pennsylvania; D011247:Pregnancy; D011295:Prenatal Care; D012923:Social Class; D014481:United States