Volume of physician visits. United States-July 1966-June 1967.
D000293:Adolescent; D000328:Adult; D001741:Black or African American; D000367:Age Factors; D000368:Aged; D002648:Child; D002675:Child, Preschool; D002908:Chronic Disease; D005191:Family Characteristics; D005260:Female; D006792:House Calls / Q000706:statistics & numerical data; D006801:Humans; D007182:Income; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008875:Middle Aged; D010548:Personal Health Services / Q000706:statistics & numerical data; D010820:Physicians / Q000706:statistics & numerical data*; D012111:Residence Characteristics; D012737:Sex Factors; D014481:United States; D044465:White People