title: Changes in morbidity, disability, and utilization differentials between the poor and the nonpoor: data from the health interview survey: 1964 and 1973.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D002908:Chronic Disease; D006296:Health Services / Q000706:statistics & numerical data*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008489:Medical Indigency; D008875:Middle Aged; D009017:Morbidity; D012189:Retrospective Studies; D014481:United States