Demographic and socioeconomic characteristics are listed for persons 6 months 74 years. A separate record for each food item consumed by each person contains the amount of calories, protein, total fat, fatty acids, cholesterol, carbohydrates, dietary fiber, alcohol, vitamin A, carotenes, alpha-tocopherol, ascorbic acid, thiamin, riboflavin, niacin, vitamin B6, folacin, vitamin B12, calcium, phosphorus, magnesium, iron, zinc, copper, sodium, and potassium. The tape also contains a description of the food, ingestion period, approximate time of consumption, and food source. Demographic characteristics are listed for persons 20-74 years. Demographic characteristics, medical history information related to vision, findings from a brief physician's examination of the eyes, and results from near and distant vision tests.
All files are fixed-length, blocked files.
Characteristics for each file, including number of records, record length, block size, and number of reels, are provided below. Data from this study are only available on tape. NTIS order no. Notes are provided to explain certain items included on the tape that are not self-explanatory or documented elsewhere. This report includes a discussion of the rationale and purpose of the survey, the sampling plan, quality control measures used, analytic methods, and some of the cross-cultural aspects of the survey.