A caution on statistics.
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D004470:Economics, Medical; D006760:Hospitalization; D006801:Humans; D007182:Income; D007223:Infant; D007231:Infant, Newborn; D008875:Middle Aged; D013223:Statistics as Topic; D014481:United States