Table 3 Results of multivariable Cox regression model for time to readmission for any reason.

Variable	Relative risk of readmission	p Value
Residence <500 miles	2.219	<0.001
Renal disease	1.579	<0.001
APRDRG weight	1.093	0.006
Angiotensin‐converting enzyme inhibitor	1.127	0.407
<6 discharge instructions received	1.323	0.011

APRDRG, all patient refined diagnosis‐related groups