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  Vol. 289 No. 3, January 15, 2003 TABLE OF CONTENTS
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Change in the Quality of Care Delivered to Medicare Beneficiaries, 1998-1999 to 2000-2001

Stephen F. Jencks, MD, MPH; Edwin D. Huff, PhD; Timothy Cuerdon, PhD

JAMA. 2003;289:305-312.

Context  Despite widespread concern regarding the quality and safety of health care, and a Medicare Quality Improvement Organization (QIO) program intended to improve that care in the United States, there is only limited information on whether quality is improving.

Objective  To track national and state-level changes in performance on 22 quality indicators for care of Medicare beneficiaries.

Design, Patients, and Setting  National observational cross-sectional studies of national and state-level fee-for-service data for Medicare beneficiaries during 1998-1999 (baseline) and 2000-2001 (follow-up).

Main Outcome Measures  Twenty-two QIO quality indicators abstracted from state-wide random samples of medical records for inpatient fee-for-service care and from Medicare beneficiary surveys or Medicare claims for outpatient care. Absolute improvement is defined as the change in performance from baseline to follow-up (measured in percentage points for all indicators except those measured in minutes); relative improvement is defined as the absolute improvement divided by the difference between the baseline performance and perfect performance (100%).

Results  The median state's performance improved from baseline to follow-up on 20 of the 22 indicators. In the median state, the percentage of patients receiving appropriate care on the median indicator increased from 69.5% to 73.4%, a 12.8% relative improvement. The average relative improvement was 19.9% for outpatient indicators combined and 11.9% for inpatient indicators combined (P<.001). For all but one indicator, absolute improvement was greater in states in which performance was low at baseline than those in which it was high at baseline (median r = -0.43; range: 0.12 to -0.93). When states were ranked on each indicator, the state's average rank was highly stable over time (r = 0.93 for 1998-1999 vs 2000-2001).

Conclusions  Care for Medicare fee-for-service plan beneficiaries improved substantially between 1998-1999 and 2000-2001, but a much larger opportunity remains for further improvement. Relative rankings among states changed little. The improved care is consistent with QIO activities over this period, but these cross-sectional data do not provide conclusive information about the degree to which the improvement can be attributed to the QIOs' quality improvement efforts.


Author Affiliations: Office of Clinical Standards and Quality, Centers for Medicare & Medicaid Services, Baltimore, Md (Dr Jencks); Division of Clinical Standards and Quality, Centers for Medicare & Medicaid Services, John F. Kennedy Building, Boston, Mass (Dr Huff); Health and Behavioral Science Research Branch, National Institute of Mental Health, Bethesda, Md (Dr Cuerdon).



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