The datafile is on one CD-ROM disc.
Documentation is on the disc.
Contains search and retrieval software. Y2K - not relevant. The NHIS includes a basic questionnaire that remains the same each year, and one or more additional questionnaires that change periodically. Information about the same person is found on all files. Each file can be linked by using the unique identification number assigned to each person which is found in locations 5-16 on each file.