Catalog of Holdings

Study Report

Study Number: QG-030-010-1-1-United States-ICPSR-1973

Subject Area: Medical and Health

Bibliographic Citation: National ambulatory medical care survey, 1973.  [machine-readable data file] / U.S. Department of Health and Human Services. National Center for Health Statistics  [principal investigator(s)] / Ann Arbor, MI: Inter-university Consortium for Political and Social Research  [distributor].

Originating Archive Number: 9192

Date Accessioned: 8/4/1994

Number of Files Received: 1

Access Status: Access limited to UW-Madison campus

Date Ordered: 7/15/1994

Documentation: 1 volume hard copy.

Abstract: The National Ambulatory Medical Care Surveys (NAMCS) supply data on ambulatory medical care provided in physicians' offices. These national estimates describe the utilization of ambulatory medical care and the nature and treatment of illness among the population seeking ambulatory care. The survey includes data on date of visit, reason for visit, date of birth, sex and race of patient, diagnosis, treatment, disposition of visit, and the physician's specialty.

SOURCE: physician-enumerated forms, and induction interviews with physicians

UNIVERSE: Office visits to nonfederally employed physicians classified by the American Medical Association (AMA) or the American Osteopathic Association (AOA) as ''office-based patient care'' (excluding specialties of anesthesiology, pathology, and radiology) from 87 Primary Sampling Units (PSUs) in the United States.

SAMPLE: Stratified multistage probability design. In the first stage the PSUs were selected by a modified probability proportional-to-size procedure using separate sampling frames for SMSAs and for nonmetropolitan counties. The second stage consisted of a probability sample for 1973 of 1,695 practicing physicians selected from the master files maintained by the AMA and AOA. Within each PSU, all eligible physicians were stratified by nine specialty groups. The groups are: general/family practice, internal medicine, pediatrics, other medical specialties, general surgery, obstetrics/gynecology, other surgical specialties, psychiatry, and other specialties. The number of physicians in scope and agreeing to participate was 1,103. The final stage was the selection of patient visits within the annual practices of sample physicians. This involved two steps. First, the total physician sample was divided into 52 with each group randomly assigned to 1 of the 52 weeks in the survey year. Second, a systematic random sample of visits was selected by the physician during the assigned week. The total number of patient records for these visits was 29,102.

NOTE: The medical information is coded using the EIGHTH REVISION INTERNATIONAL CLASSIFICATION OF DISEASES, ADAPTED FOR USE IN THE UNITED STATES (ICDA).

EXTENT OF COLLECTION: 1 data file.

RESTRICTIONS: Individual identifiers have been removed from the microdata tapes available from the National Center for Health Statistics. Nevertheless, under section 308(d) of the Public Health Service Act (42 U.S.C. 242m), data collected by the National Center for Health Statistics may not be used for any purpose other than for statistical reporting. ICPSR recommends to users that individual elementary unit data contained in this collection be used solely for statistical research.

DATA TYPE: survey data

DATA FORMAT: LRECL

TIME PERIOD: 1973-1974

RELATED PUBLICATIONS:

National Center for Health Statistics. ''National Ambulatory Medical Care Survey: Background and Methodology, United States.'' VITAL AND HEALTH STATISTICS. Series 2-No. 61 DHEW Pub. (HRA) 74-1335. Health Resources Administration. Washington, DC: United States Government Printing Office, 1974. National Center for Health Statistics. ''National Ambulatory Medical Care Survey: Symptom Classification, United States.'' VITAL AND HEALTH STATISTICS, Series 2-NO. 63. DHEW Publication No. (PHS) 74-1337. Health Resources Administration. Washington, DC: United States Government Printing Office, 1974. National Center for Health Statistics. EIGHTH REVISION INTERNATIONAL CLASSIFICATION OF DISEASES, ADAPTED FOR USE IN THE UNITED STATES (ICDA). PHS Pub. No. 1693. Public Health Service. Washington, DC: United States Government Printing Office, 1967.

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