Mortality by socioeconomic status, 1959-61 and 1969-71.
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D066298:In Vitro Techniques; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008396:Maryland; D008875:Middle Aged; D009026:Mortality; D012424:Rural Population; D012959:Socioeconomic Factors; D014505:Urban Population