Basic data on health care needs of adults ages 25-74 years: United States, 1971-75.
D000328:Adult; D000367:Age Factors; D000368:Aged; D005260:Female; D006301:Health Services Needs and Demand / Q000639:trends*; D006302:Health Services Research / Q000639:trends*; D006306:Health Surveys; D006801:Humans; D008297:Male; D008722:Methods; D008875:Middle Aged; D012959:Socioeconomic Factors; D013223:Statistics as Topic; D014481:United States