Survey description
The National Survey of Ambulatory Surgery (NSAS) was first conducted in 1994 to gather and
disseminate nationwide data about ambulatory surgery performed in hospitals and
freestanding ambulatory surgery centers. Survey data was abstracted from sampled medical
records of ambulatory surgery visits in hospitals and freestanding ambulatory surgery
centers.
Data file description
Medical record data include age, sex, race, expected source
of payment, discharge status, visit date, type of anesthesia, and anesthesia
administrator. Facility characteristics include region of the country and whether the
facility is a hospital or a free standing ambulatory surgery center. Diagnostic data
include up to seven diagnoses per patient. Data on procedures include a maximum of six
procedures per patient. Diagnoses and procedures were coded according to the
International
Classification of Diseases, Ninth Revision, Clinical Modification ICD-9-CM.
The tapes contain no confidential data.
List of data file variables at a
glance
Patient data
Age at date of visit
Sex
Race
Expected source of payment
Data of visit (month)
Discharge state
Type of anesthesia
Anesthesia administrator
Diagnostic and procedure codes
Diagnostic codes (one to seven 5-digit ICD-9-CM codes)
Procedure codes (zero to six 4-digit ICD-9-CM procedure codes)
Facility data
Hospital or free-standing ambulatory surgery center
Weight (final adjusted weight for each sample record)
Geographic region of facility
Data file technical characteristics
Data
year
Number
of
records
1996
125,433
1995
121,564
1994
117,861
Geographic coverage
NSAS is a nationwide survey that allows analysis at the
U.S. Bureau of Census region level.
Data availability
NSAS data are available on CD-ROM in ASCII for calendar years 1994-96.
Data are also available on a single CD-ROM for 1994-96 with the Statistical
Export and Tabulation System (SETS)
retrieval software.
Ordering information
NSAS CD-ROM can only be purchased through the National Technical Information Service (NTIS).
Call NTIS for current pricing information. The order numbers are as follows:
Data on CD-ROM - ASCII
Data
year
NTIS
order no.
1996
PB98-502362
1995
PB98-500218
1994
PB97-501506
Data on CD-Rom - SETS
Data
year
NTIS
order no
GPO
order no.
1994-96
PB99-501801
017-022-01458-1
Documentation contents
NSAS data file comes with the necessary documentation,
including content and technical information, needed to access the data.
Documentation is available electronically on CD-ROM.
Related reports
A report with a detailed description of the survey sample
design, estimating procedures, and sampling errors and a report combining ambulatory
surgery and inpatient survey are expected to be published late in 1997 in Vital and
Health Statistics. Data are also published in the Advance Data
series.
Contact
Hospital Care Statistics Branch
Division of Health Care Statistics
Centers for Disease Control and Prevention
3311 Toledo Road, Room 3409
Hyattsville, Maryland 20782-2003
(301) 458-4409
codes)