This report presents results of a quantitative examination of the dynamics of hospital performance: the degree to which hospitals are improving (or deteriorating) in quality and efficiency over time. Results indicate significant improvements across hospitals in reducing mortality and increasing efficiency over 2001--2005, with mixed results in complication and morbidity rates. Reduced mortality is likely due to improvements in care, such as better diagnostic techniques and earlier interventions, as well as more conscientious record "coding" and changing discharge practices. Consistent reductions in length of stay underscore the financial pressures on hospitals, perhaps combined with improved ability to stabilize, treat, and discharge patients. The characteristics of the most-improving hospitals indicate that quality improvement is immanently attainable, occurring at least as much among small, non-teaching institutions as among their larger, more prominent counterparts. A companion report, Hospital Quality Improvement: Strategies and Lessons from U.S. Hospitals, presents case studies of four top-improving hospitals identified in this analysis.
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