National Hospital Ambulatory Medical Care Survey: 1998 outpatient department summary.
OBJECTIVE
This report describes ambulatory care visits to hospital outpatient departments in the United States. Statistics are presented on selected hospital, clinic, patient, and visit characteristics.


METHODS
The data presented in this report were collected from the 1998 National Hospital Ambulatory Medical Care Survey (NHAMCS). NHAMCS is part of the ambulatory care component of the National Health Care Survey that measures health care utilization across various types of providers. NHAMCS is a national probability sample survey of visits to hospital outpatient and emergency departments of non-Federal, short-stay, and general hospitals in the United States. Sample data are weighted to produce annual estimates.


RESULTS
During 1998, an estimated 75.4 million visits were made to hospital outpatient departments in the United States, an overall rate of 28.0 per 100 persons. Visit rates did not vary by age except in a comparison of the 15-24 year old group with the 75 years and over age group. Black persons had higher rates of visits than white persons as did women compared with men. Of all visits made to hospital outpatient departments in 1998, 33.8 percent and 25.9 percent, respectively, listed private insurance and Medicaid as the primary expected source of payment, and 21.9 percent were made by patients belonging to a health maintenance organization. There were an estimated 7.1 million injury-related outpatient department visits during 1998.
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D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D004194:Disease / Q000145:classification; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D005260:Female; D019538:Health Care Surveys; D006279:Health Maintenance Organizations / Q000706:statistics & numerical data; D006801:Humans; D008297:Male; D008875:Middle Aged; D010044:Outpatient Clinics, Hospital / Q000145:classification / Q000706:statistics & numerical data*; D010045:Outpatients / Q000145:classification; D012051:Reimbursement Mechanisms; D014481:United States / Q000453:epidemiology