title: The relation between social class and functional status: a new look at the drift hypothesis.
mesh_terms: D001061:Appalachian Region; D004522:Educational Status; D005006:Ethnicity; D005260:Female; D006305:Health Status Indicators; D006801:Humans; D008297:Male; D009017:Morbidity; D012380:Role; D012744:Sex Ratio; D012923:Social Class; D012937:Social Mobility