A. Current and Projected Supply of Chiropractors

    In 1970, there were an estimated 13,000 chiropractors licensed in the United States (Cooper, 1996). This number had increased to 40,000 in 1990 and to approximately 50,000 in 1994. Thus, there is roughly one chiropractor for every 5,000 U.S. residents. Estimates of the proportion of chiropractors who are in full-time practice range from 82 percent in a large national survey conducted in 1993 (Christensen) to 96 percent in a 1995 survey of members of the American Chiropractic Association (Goertz, 1996). Almost 90 percent of chiropractors report working at least 30 hours per week (Christensen, 1993) and the average chiropractor claims to work about 42 hours per week (Goertz, 1996). Estimates of the percentage of chiropractors in solo private practice range from 67 percent (Christensen, 1993) to 76 percent (Goertz, 1996), indicating that most chiropractors have remained in solo practice.
    In 1995, there were 14,040 students enrolled in the 16 accredited chiropractic colleges, 2,864 of whom graduated in that year.³ The enrollment patterns in chiropractic colleges have been stable for the last several years with no new colleges being established since 1994. It appears that enrollments in chiropractic colleges are beginning to stabilize after a period of growth. However, with about 2,900 graduates per year, an increasing proportion of chiropractors is recent graduates.
    A recent study estimated that the number of chiropractors will double by the year 2010 (to over 100,000), far exceeding the 16 percent increase projected for medical doctors (Cooper, 1996). This projection is based on two assumptions: (1) the number of chiropractor students will increase by 25 percent over the next 5 years and then stabilize and (2) 27 percent of currently active chiropractors will die or retire by 2010. Thus, it appears that chiropractors will represent a substantially larger proportion of health care professionals in the coming years.

B. Geographic Distribution

    Colleges of chiropractic are not evenly distributed throughout the United States. Of the 16 accredited schools, 4 are in California, 2 in Texas, 2 in Missouri. The other eight are distributed in Oregon, Minnesota, Illinois, New York State, Georgia, Iowa, Connecticut, and South Carolina. Partly as a result of the distribution of the colleges, the practitioners are not evenly distributed throughout the states. Data from the Federation of Chiropractic Licensing Boards (FCLB) on the number of chiropractors licensed in each of the States in 1993 and 1995 (FCLB, 1996) are

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3. Center for Studies in Health Policy, Inc. Washington, DC. Personal communication of unpublished 1995 data from Meredith Gonyea, PhD.

Chiropractic in the United States

presented in Table IV-1. States with more than 3,000 chiropractors in 1995 were: California, New York, Florida, Pennsylvania, and Texas. Twenty-two States had more than 1,000 chiropractors. California, with 9,879 licensed chiropractors, had twice the number of the next largest state (New York).
    The FCLB information, in conjunction with data on the estimated population in each state during these years, permitted estimation of the number of licensed chiropractors in each state per 100,000 population (Table 11). Because some chiropractors are licensed in more than one state and a substantial fraction is not practicing full-time (or at all), these numbers undoubtedly overestimate the supply of chiropractors. In addition, the dramatic differences in the reported number of chiropractors between 1993 and 1995 in some States (e.g., Hawaii, Illinois, New York, and Pennsylvania) casts further doubt on the accuracy of these data. Alternatively, changes in examination requirements, maintenance of inactive vs. active licenses and examination and license fees may account for year to year differences.
    Nevertheless, the data are probably adequate for identifying States or at least regions that have particularly high or low population-to-chiropractor ratios. Specifically, States with the fewest chiropractors per 100,000 population in 1995 were: District of Columbia, Louisiana, Maryland, Mississippi, and West Virginia. The States with the most chiropractors per capita were: Arizona, Colorado, and Hawaii. It appears that States in the West have been generally more hospitable to chiropractors than those in the South and East. About 60 percent of chiropractors worked in urban or suburban communities, 35 percent in small towns, and 5 percent in rural areas (Goertz, 1996).

C. Utilization of Chiropractic Services

    The proportion of the United States population that uses chiropractors and the number of chiropractic visits per capita have about doubled in the past 15-20 years. A 1980 national survey commissioned by the United States Department of Health, Education, and Welfare reported that 3.6 percent of the population used chiropractors that year and that there were 62 visits per 100 person-years (Von Kuster, 1980). The 1980 National Medical Care Utilization and Expenditure Survey found that 4 percent of the population saw a chiropractor (Mugge, 1984; Mugge, 1986). A community-based study of claims data collected between 1974 and 1982 reported that there were 41 chiropractic visits per 100 person-years (Shekelle, 1991). Each of the above studies also reported both large-area and small-area geographic variations in chiropractic use. More recently, a national telephone survey of the United States adult population reported that 7 percent of persons had used a chiropractor in the prior year (Eisenberg, 1993), and the chiropractic visit rate, as calculated from a recent cluster sample in 5 communities in the U.S., was 100 visits per 100 person-years (Hurwitz, in press). In this study, there were only small (less than 10 percent) differences in the estimated use rates among sites (San Diego, California; Portland, Oregon; Vancouver, Washington; Minneapolis-St. Paul, Minnesota; Miami, Florida).

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Table 11. Number of Licensed Chiropractors per 100,000 Population, by State: 1993 and 1995

STATE  1993  1995   Licensed Chiros. Number per 100,000 Licensed Chiros. Number per 100,000 Alabama 661 16.4 671 16.6 Alaska 162 29.4 186 33.8 Arizona 2,167 59.1 2,384 65.1 Arkansas 493 21.0 508 21.6 California 10,692 35.9 9,879 33.2 Colorado 1,566 47.6 1,696 51.5 Connecticut 893 27.2 858 26.1 Delaware 200 30.0 209 31.4 Dist. Columbia 93 15.3 39 6.4 Florida 3,896 30.1 4,355 23.0 Georgia 2,026 31.3 2,237 44.7 Hawaii 486 43.8 712 64.3 Idaho 301 29.9 338 33.6 Illinois 2,399 21.0 2,912 25.5 Indiana 919 16.6 900 16.2 Iowa 1,270 45.7 1,231 39.1 Kansas 614 24.8 637 25.7 Kentucky 1,162 31.5 1,055 28.6 Louisiana 566 13.2 592 14.0 Maine 358 29.2 375 30.5 Maryland 489 10.2 488 10.2 Massachusetts 1,422 23.6 1,220 20.3 Michigan 2,390 25.7 2,440 26.2 Minnesota 1,582 36.2 1,613 36.9 Mississippi 335 13.0 330 12.5 Missouri 1,864 36.4 1,856 36.3 Montana 364 45.6 228 28.5 Nebraska 263 16.7 281 17.8 Nevada 308 25.6 326 27.1 New Hampshire 401 36.2 435 39.2 New Jersey 2,850 36.9 2,701 34.9 New Mexico 558 36.8 577 38.1 New York 7,558 42.0 4,926 27.4 North Carolina 1,101 16.6 1,292 19.5 North Dakota 205 32.1 224 35.1 Ohio 1,563 14.4 1680 15.5 Oklahoma 960 30.5 980 31.1 Oregon 785 27.6 877 30.9 Pennsylvania 5,127 43.1 3,190 26.8 Rhode Island 161 16.0 158 15.8 South Carolina 1,015 29.1 1,097 31.4 South Dakota 188 27.0 201 28.9 Tennessee 600 12.3 780 16.0 Texas 3,347 19.7 3,682 21.7 Utah 425 24.7 580 33.6 Vermont 330 58.6 261 46.4 Virginia 950 15.4 1,090 17.6 Washington 1,593 32.7 1,625 33.4 West Virginia 280 15.6 255 14.2 Wisconsin 1,661 34.0 1,764 36.1 Wyoming 198 43.6 183 40.3

Source: Federation of Chiropractic Licensing Boards. Official Directory: Chiropractic Licensure and Practice Statistics: 1996-97 Edition.

Chiropractic in the United States

References

Christensen M, Morgan D (eds). Job Analysis of Chiropractic: A Project Report of the Practice of Chiropractic Within the United States. Greeley, CO: National Board of Chiropractic Examiners, 1993.

Cooper RA, Stoflet SJ. Trends in the education and practice of alternative medicine clinicians. Health Affairs 1996;15:226-38.

Eisenberg DM, Kessler RC, Foster C, et al. Unconventional medicine in the U.S. N Engl J Med 1993;328(4):246-52.

Federation of Chiropractic Licensing Boards. Official Directory: Chiropractic Licensure and Practice Statistics: 1996-97 Edition. Federation of Licensing Boards, 1996.

Goertz C. Summary of the 1995 ACA annual statistical survey on chiropractic practice. J Amer Chiropr Assoc 1996;33(6):35-41.

Hurwitz EL, Coulter ID, Adams AH, Genovese BJ, Shekelle PG. Utilization of chiropractic services in the United States and Canada: 1985-1991. Am J Publ Hlth (in press).

Mugge RH. Persons Receiving Care from Selected Health Care Practitioners, United States, 1980. National Medical Care Utilization and Expenditure Survey. Series B, Descriptive Report No. 6. DHHS Pub. No. 84-20206. National Center for Health Statistics, Public Health Service. Washington, DC: US Government Printing Office, Sept. 1984.

Mugge RH. Utilization of Chiropractic Services in the United States. National Center for Health Statistics. Paper prepared for presentation at the Meetings of the American Public Health Association in Las Vegas, NV, Oct. 1, 1986.

Shekelle PG, Brook RH. A community-based study of the use of chiropractic services. Am J Publ Hlth 1991;81:439-42.

Von Kuster T, Jr. Chiropractic Health Care: A National Study of Cost of Education, Service, Utilization, Number of Practicing Doctors of Chiropractic and Other Key Policy Issues. Washington, DC: The Foundation for the Advancement of Chiropractic Tenets and Science, 1980.

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