The 1994, 1995, and 1996 NSAS datasets are located in: ftp://ftp.cdc.gov/pub/Health_Statistics/NCHS/Datasets/NSAS The documentation files for the 1994, 1995 and 1996 NSAS dataset are located in: ftp://ftp.cdc.gov/pub/Health_Statistics/NCHS/Dataset_Documentation/NSAS The dataset files listed below have been compressed into three separate files. To load and expand them, use a ZIP extraction program (such as PkZip) to install this data in a directory (folder) on your hard drive. The documentation is in .pdf format. Size (bytes) File Name File Description Compressed Uncompressed NSAS94.ZIP NSAS dataset files 1,565,000 11,668,000 NSAS95.Zip NSAS dataset files 1,563,000 12,034,000 NSAS96.ZIP NSAS dataset files 1,624,000 12,417,000 NSAS94-96DOC.pdf NSAS documentation files 68,076 The documentation files listed below are referenced in the above ( NSAS94-96DOC.pdf) file. These files are in lotus format. 1yr-94.WK1 36,746 1yr-95.WK4 38,788 1yr-96.WK4 44,708 nsasstdr.WK4 117,624 REG94.WK1 31,318 REG95.WK4 31,692 REG96.WK4 30,704 Total compressed file size (data only) = 4,752,000 Total inflated file size = 46,187,076 CAUTION - Because the NSAS is a sample survey, the application of weights to the sample data is needed in order to produce national estimates of surgical and nonsurgical procedures done on an ambulatory basis in hospital and freestanding ambulatory surgery centers. Statement of Authenticity: This material has been cleared for public distribution by CDC/ATSDR and will be authentic if obtained directly from ftp.cdc.gov. CDC/ATSDR takes all effort to assure the authenticity of electronically distributed documents. However, in all instances where the electronic and official agency record differ, the authenticity of the official agency record is controlling. For questions, suggestions, or comments concerning NSAS data, please contact the National Survey of Ambulatory Surgery at (301) 458-4409. These and other survey data are also available on CD-ROM and public use data tape, as well as in published summaries. For additional information on NCHS data products, contact the: Data Dissemination Branch, NCHS 3311 Toledo Road Hyattsville, MD 20782 Tel: (301) 458-4321 E-mail: nchsquery@cdc.gov Internet: http://www.cdc.gov/nchswww/default.htm