Judging hospitals by severity-adjusted mortality rates: the case of CABG surgery

UMMS Affiliation

Department of Quantitative Health Sciences



Document Type


Medical Subject Headings

Adolescent; Adult; Aged; Aged, 80 and over; Coronary Artery Bypass; Female; Health Services Research; *Hospital Mortality; Hospitals; Humans; Logistic Models; Male; Middle Aged; *Outcome and Process Assessment (Health Care); Prognosis; *Severity of Illness Index; United States


Biostatistics | Epidemiology | Health Services Research


In many health care marketplaces, outcomes assessment is central to monitoring quality while controlling costs. Comparing outcomes across providers generally requires adjustment for patient severity. For mortality rates and other adverse outcomes comparisons, severity adjustment ideally aims to control for patient characteristics prior to the health care intervention. A variety of severity methodologies, specifically for hospitalized patients, are commercially available. Some have been adopted by state or regional initiatives for publicly comparing hospital outcomes. We applied 14 common severity measures to the same data set to determine whether judgments about risk-adjusted hospital death rates are sensitive to the specific severity method. We examined 7,765 patients undergoing coronary artery bypass graft (CABG) surgery at 38 hospitals. Unadjusted death rates ranged from 0% to 11.2% across hospitals. Comparisons of relative hospital performance were relatively insensitive to the severity adjustment method.

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Citation: Inquiry. 1996 Summer;33(2):155-66.

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