Table 1.

Summaries of demographic and selected other variables.

Variable	Median [IQR]/Count (%)
	n = 51,824
Age, years	68.3 [61.4–74.5]
Sex
F	30801 (59.4%)
M	21023 (40.6%)
Race
White	45777 (88.3%)
Black	3847 (7.4%)
Other	2200 (4.2%)
BMI, kg/m2	30.4 [26.6–35.1]
Procedure
Knee	32510 (62.7%)
Hip	19314 (37.3%)
MME/day	40.0 [23.3–64.0]
LOS, hours	54.3 [32.6–76.2]
LOS, days	2.0 [1.0–3.0]
Readmission
No	49955 (96.4%)
Yes	1869 (3.6%)