Table IV.

Multivariable regression model predicting hospital length of stay.

Variable	β-coefficient (95% CI)	p-value*
Age	0.01 (-0.01 to 0.02)	0.390
Sex (ref: female)	-0.03 (-0.23 to 0.17)	0.739
BMI	0.01 (-0.01 to 0.03)	0.409
Primary language (ref: English)	0.04 (-0.16 to 0.20)	0.642
ASA (ref: I)
ASA II	0.01 (-0.5 to 0.51)	0.981
ASA III	-0.18 (-0.71 to 0.34)	0.488
CCI	0.01 (-0.07 to 0.08)	0.896
Inflammatory arthritis	-0.06 (-0.31 to 0.2)	0.657
Diabetes mellitus	0.07 (-0.18 to 0.24)	0.475
Cohort (ref: pre-COVID)
Post-COVID	1.05 (-1.23 to -0.86)	<0.001

^*Multivariable regression analysis.

ASA, American Society of Anesthesiologists; CCI, Charlson Comorbidity Index; CI, confidence interval; OA, osteoarthritis.