Adjusted hospital death rates: a potential screen for quality of medical care.
R W Dubois,
R H Brook and
W H Rogers
Increased economic pressure on hospitals has accelerated theneed to develop a screening tool for identifying hospitals thatpotentially provide poor quality care. Based upon data from93 hospitals and 205,000 admissions, we used a multiple regressionmodel to adjust the hospitals crude death rate. The adjustmentprocess used age, origin of patient from the emergency departmentor nursing home, and a hospital case mix index based on DRGs(diagnostic related groups). Before adjustment, hospital deathrates ranged from 0.3 to 5.8 per 100 admissions. After adjustment,hospital death ratios ranged from 0.36 to 1.36 per 100 (actualdeath rate divided by predicted death rate). Eleven hospitals(12 per cent) were identified where the actual death rate exceededthe predicted death rate by more than two standard deviations.In nine hospitals (10 per cent), the predicted death rate exceededthe actual death rate by a similar statistical margin. The 11hospitals with higher than predicted death rates may provideinadequate quality of care or have uniquely ill patient populations.The adjusted death rate model needs to be validated and generalizedbefore it can be used routinely to screen hospitals. However,the remaining large differences in observed versus predicteddeath rates lead us to believe that important differences inhospital performance may exist.
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