Table 2:

Observed-to-expected ratios for death or urgent readmission within 30 days for the 162 hospitals included in the study, calculated using 4 different measures^*

Measure	Observed-to- expected ratio, mean ± SD	Observed-to- expected ratio, median (range)
All admissions, adjusted for patient age and sex	1.11 ± 0.21	1.10 (0.45–1.77)
Single admission per patient, adjusted for patient age and sex	1.14 ± 0.23	1.13 (0.44–1.83)
All admissions, adjusted for all measurable factors	0.94 ± 0.11	0.93 (0.71–1.39)
Single admission per patient, adjusted for all measurable factors	0.94 ± 0.12	0.94 (0.63–1.40)

Note: SD = standard deviation.

^*The number of expected events was calculated by use of logistic regression models. Age- and sex-adjusted ratios calculated the expected number of events after adjustment for patient age and sex; completely adjusted ratios used the LACE+ model to determine the expected numbers of events.