Incomplete EHR		Advanced EHR
Percent of patients cared for by a hospitalist	Admission	Predicted average LOS (SE)b	Admission	Predicted average LOS (SE)b	Difference	P
50% or Less	25,669	4.99 (0.002)	4309	4.84 (0.003)	0.15	<.01
Higher 50%	15,908	4.62 (0.002)	3690	4.58 (0.004)	0.04	.278

EHR indicates electronic health record; LOS, length of stay.

^aAdvanced EHR includes clinical data repository; clinical decision support; computerized physician order entry; physician documents; Electronic Medication Administration Record (eMAR); nursing documents.

^bAdjusted for age, sex, race, low socioeconomic status, comorbidity, Major Diagnosis Category (MDC) group, diagnosis-related group weight, number of hospitalizations in the year before admission, number of doctor visits in the year before admission, emergency department admission, weekend admission, admission with subsequent intensive care unit use, geographic region, metropolitan-area size, type of hospital, hospital size, and medical school affiliation.

The main difference between Table 2 and eAppendix Table 1 is the definition of EHR. eAppendix Table 1 defines an Advanced EHR to include 6 applications. Table 2 defines a Complete EHR to include 4 applications.