Inter-hospital mortality and morbidity variation in Pennsylvania.

A 1986 Pennsylvania law requires the public disclosure of hospital mortality and morbidity rates. This study of hospital admissions in 1989 and 1990 examines the variation in these health-outcome indicators for the 10 most frequently occurring DRGs in the adult medical service in a sample of 20 Pennsylvania hospitals. These mortality and morbidity rates are adjusted for admission severity, DRG, age, and sex, using a logistic regression model. The null hypothesis of no significant variation among hospitals is rejected by the statistically significant (p < 0.01) results of a likelihood ratio test on the hospital variables in logit models for both mortality and morbidity. Test results also show that 4 (20 percent) of 20 hospitals have statistically significant (p < 0.05) adjusted mortality rates, and 4 (20 percent) of 20 hospitals have significant morbidity rates. Such information may impact hospital management practices in a variety of ways.