National Ambulatory Medical Care Survey, 1991 (ICPSR 6430)
The National Ambulatory Medical Care Survey (NAMCS) provides data from samples of patient records selected from a national sample of office-based physicians. These national estimates describe the utilization of ambulatory medical care services in the United States. In 1991, there were 33,795 patient records provided by 1,354 doctors who participated in the survey. The survey obtains information on the age, race, and sex of the patient, and on physician characteristics such as geographic location and specialization. Data describing the nature of the office visit include the expected source of payment, patient's problem, prior visit status, referral status, physician's diagnoses, diagnostic and therapeutic services provided, and disposition and duration of the visit. Other variables cover drugs/medications ordered, administered, or provided during office visits, such as medication code, generic name and code, brand name, entry status, prescription status, composition status, and related ingredient codes.
The public-use data files in this collection are available for access by the general public. Access does not require affiliation with an ICPSR member institution.
U.S. Dept. of Health and Human Services, National Center for Health Statistics. NATIONAL AMBULATORY MEDICAL CARE SURVEY, 1991. ICPSR version. Hyattsville, MD: U.S. Dept. of Health and Human Services, National Center for Health Statistics [producer], 1993. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 1995. http://doi.org/10.3886/ICPSR06430.v1
Persistent URL: https://doi.org/10.3886/ICPSR06430.v1
Scope of Study
Geographic Coverage: United States
Universe: Office visits made within the United States by patients of nonfederally-employed physicians who were primarily involved in office-based patient care activities, but not engaged in the specialties of radiology, pathology, or anesthesiology.
Per agreement with NCHS, ICPSR distributes the data file(s) and technical documentation in this collection in their original form as prepared by NCHS.
Sample: The 1991 NAMCS sample included 2,540 physicians: 2,276 medical doctors and 264 doctors of osteopathy. The survey utilized a multistage probability sample design. Primary sampling units were selected in the first stage, physician practices within PSUs in the second stage, and patient visits to selected physicians in the third stage.
patient visit records completed by physicians
Restrictions: In preparing the data file(s) for this collection, the National Center for Health Statistics (NCHS) has removed direct identifiers and characteristics that might lead to identification of data subjects. As an additional precaution, NCHS requires, under Section 308(d) of the Public Health Service Act (42 U.S.C. 242m), that data collected by NCHS not be used for any purpose other than statistical analysis and reporting. NCHS further requires that analysts not use the data to learn the identity of any persons or establishments and that the director of NCHS be notified if any identities are inadvertently discovered. ICPSR member institutions and other users ordering data from ICPSR are expected to adhere to these restrictions.
Original ICPSR Release: 1995-03-16
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