title: Correlation of IQ in subjects with Down syndrome and their parents and sibs.
mesh_terms: D000293:Adolescent; D002648:Child; D002674:Child, Institutionalized; D004314:Down Syndrome / Q000235:genetics*; D005190:Family; D005260:Female; D006801:Humans; D007361:Intelligence Tests; D008297:Male; D009679:Nuclear Family; D012931:Social Environment