10.3886/ICPSR09797.v3 United States Department of Health and Human Services. Centers for Disease Control and Prevention. National Center for Health Statistics Inter-university Consortium for Political and Social Research 1992 chronic disabilities chronic illnesses disabilities doctor visits health health care health care costs health care facilities health care services health policy health problems illness insurance coverage medical care 1992-10-31 2010-11-29 clinical data; survey data 9797 3 The purpose of the National Health Interview Survey (NHIS) is to obtain information about the amount and distribution of illness, its effects in terms of disability and chronic impairments, and the types of health services people receive. The 1974 Medical Care Supplement File provides variables from the core Person File (see HEALTH INTERVIEW SURVEY, 1974 [ICPSR 8339]) including sex, age, race, marital status, veteran status, education, income, industry and occupation codes, and limits on activity. The variables unique to this Medical Care Supplement (Part 1) include items on type of doctor visits (private vs. group practice), place of care, number of doctor visits in the last 12 months, type of doctor usually seen, payment source for doctor bills, problems getting care in the past year, and type of medical services received in the last twelve months.