High-volume and low-volume users of health services: United States, 1980.

Data from the National Medical Care Utilization and Expenditure Survey of 1980 are used to examine the characteristics of high-volume users of health care services, contrasting them with low-volume users and those who used no services at all. The three major types of medical care services examined are hospital inpatient care, ambulatory visits, and prescribed medications. Low users were defined, respectively, as those who during the year had either one or two hospital days, one nondental visit to a physician or nonphysician, and one prescribed medicine acquisition. High users were those with, respectively, 17 or more hospital days, 20 or more visits, and 25 or more prescribed medicine acquisitions. A very small percent of the U.S. civilian noninstitutionalized population and of those who used services at all during the year consume a large percent of services in each of the three service types. High users of inpatient hospital care constitute 1.7 percent of the civilian noninstitutionalized population and 15 percent of persons hospitalized during the year, yet they used 54.4 percent of all hospital days used by the reference population. High users of ambulatory services constitute 4.5 percent of the reference population and only 5.7 percent of all users of ambulatory services, yet they accounted for 32.3 percent of all ambulatory visits. For prescribed medications, only 3.7 percent of the civilian noninstitutionalized population are high users, comprising 5.9 percent of all users, but they account for 32.9 percent of all prescription acquisitions. At the other extreme, low users of ambulatory care visits represent 17 percent of the reference population, and 21 percent of all users of such care, but only 3.3 percent of all visits. High users share certain characteristics. They are more likely than low users to be older and poorer, to have poorer health status and more medical conditions, and are more likely to have functional limitations. Both univariate and multivariable analyses show that the most important distinguishing characteristics of high users of any of the three medical services are poor health status, severe functional limitations, and the presence of multiple medical conditions--most importantly cancer, cardiac disorders, musculoskeletal diseases, respiratory diseases, and injuries and poisonings. Almost all high-volume users of every category of service (88 percent for hospital days, 89 percent for ambulatory visits, and 94 percent for prescribed medications) had at least three different diagnostic conditions reported during the year.(ABSTRACT TRUNCATED AT 400 WORDS)