National Hospital Ambulatory Medical Care Survey, 2007 (ICPSR 28442)
Published: Jun 24, 2010 View help for published
Principal Investigator(s): View help for Principal Investigator(s)
United States Department of Health and Human Services. Centers for Disease Control and Prevention. National Center for Health Statistics
Summary View help for Summary
The National Hospital Ambulatory Medical Care Survey (NHAMCS) provides data from samples of patient records selected from emergency departments (EDs) and outpatient departments (OPDs) of a national sample of hospitals. The resulting national estimates describe the use of hospital ambulatory medical care services in the United States. For the 2007 survey, data were collected from 202 OPDs and 432 EDs. Among the variables included are age, race, and sex of the patient, reason for the visit, physician's diagnoses, cause of injury, surgical procedures (OPDs only), medication therapy, and expected source of payment. For 2007, additional updates and revisions have been made to both the emergency department and outpatient department data, including modifications to pre-existing variables pertaining but not limited to electronic medical records.
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Subject Terms View help for Subject Terms
Geographic Coverage View help for Geographic Coverage
Restrictions View help for Restrictions
In preparing the data files 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.
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Date of Collection View help for Date of Collection
Data Collection Notes View help for Data Collection Notes
Users should be aware that Stata will not allow value labels for character (string) format variables. The 2007 NHAMCS data contain a number of character variables (e.g., DIAG1, DIAG2, and DIAG3 -- physician's listed diagnosis codes).
A numeric recode version of the diagnosis variables (DIAG1R, DIAG2R, DIAG3R) has been included in the data. Value labels have been added to the SAS and SPSS setup files. Users may verify the labeling of the numeric recode variables by referring to the character (string) format variables DIAG1, DIAG2, and DIAG3. Please consult the User Guide for detailed information regarding numeric recodes for cause of injury, diagnosis, and procedure codes.
Per agreement with the National Center for Health Statistics (NCHS), ICPSR distributes the data files and text of the technical documentation for this collection as prepared by NCHS.
Detailed information regarding the use of weight variables and variance estimation is located in the User Guide.
Sample View help for Sample
The National Hospital Ambulatory Medical Care Survey (NHAMCS) used a four-stage probability design with samples of primary sampling units (PSUs), hospitals within PSUs, clinics within hospitals, and patient visits within clinics.
Universe View help for Universe
Visits to the emergency and outpatient departments of noninstitutional general and short-stay hospitals within the 50 states and the District of Columbia, which had an average length of stay of less than 30 days, or to hospitals whose specialty was general (medical or surgical) or children's general. Excluded were federal hospitals, hospital units within institutions, and hospitals with less than six beds staffed for patient use.
Data Source View help for Data Source
Patient visit records from hospital emergency departments and outpatient departments.
Data Type(s) View help for Data Type(s)
Original Release Date View help for Original Release Date
Version Date View help for Version Date
Version History View help for Version History
- United States Department of Health and Human Services. Centers for Disease Control and Prevention. National Center for Health Statistics. National Hospital Ambulatory Medical Care Survey, 2007. ICPSR28442-v1. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2010-06-24. http://doi.org/10.3886/ICPSR28442.v1
2010-06-24 ICPSR data undergo a confidentiality review and are altered when necessary to limit the risk of disclosure. ICPSR also routinely creates ready-to-go data files along with setups in the major statistical software formats as well as standard codebooks to accompany the data. In addition to these procedures, ICPSR performed the following processing steps for this data collection:
- Created variable labels and/or value labels.
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.
This study is maintained and distributed by the National Archive of Computerized Data on Aging (NACDA), the aging program within ICPSR. NACDA is sponsored by the National Institute on Aging (NIA) at the National Institutes of Heath (NIH).