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The basic 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 kinds of health services people receive. There are five types of records in the core survey, each in a separate data file. The variables in the Household File (Part 1) include type of living quarters, size of family, number of families in household, and geographic region. The variables in the Person File (Part 2) include sex, age, race, marital status, veteran status, education, income, industry and occupation codes, and limits on activity. These variables are found in the Condition, Doctor Visit, and Hospital Episode Files as well. The Person File also supplies data on height, weight, bed days, doctor visits, hospital stays, years at residence, and region variables. The Condition (Part 3), Doctor Visit (Part 4), and Hospital Episode (Part 5) Files contain information on each reported condition, two-week doctor visit, or hospitalization (twelve-month recall), respectively. A sixth, seventh, eighth, ninth, and tenth file have been added along with the five core files. The Dental Health Supplement (Part 6) includes variables that report on dental care and dental health, as well as dental visits, length of hospital stay, reasons for visits to the dentist, use of fluorides, and other oral health practices. Respondents for the Functional Limitations Supplement (Part 7) were persons age 65 and older. Questions concerned degree of difficulty in performing activities of daily living. The Health Insurance Supplement (Part 8) contains questions pertaining to job stability and layoff as well as type of insurance held, such as Medicare or other types of health insurance coverage. For the Longest Job Worked Supplement (Part 9) respondents were persons age 25 or older who had worked. Information obtained in this supplement determines the effects of a person's job on his or her health. Respondents for the Vitamin/Mineral Intake Supplement (Part 10) were sampled from those age 2-6 and those 18 or older. Proxies for the children and the adults themselves were asked questions to determine individual consumption of these nutrients and their effects on health.