Table V.

Logistic regression comparing simultaneous bilateral and unilateral total knee arthroplasty: warfarin prophylaxis cohort

Variable	PE model		p-value*	Combined VTE model		p-value*
	Exp RR	95% CI		Exp RR	95% CI
Simultaneous bilateral TKA	1.75	1.25 to 2.44	0.001	1.67	1.21 to 2.29	0.002
NIS VTE score (per 10 points)†	1.12	1.07 to 1.17	< 0.0001	1.13	1.08 to 1.17	< 0.0001

*p-values calculated using logistic regression †NIS VTE score excluding bilateral joint as a risk factor PE, pulmonary embolism; VTE, venous thromboembolism; Exp RR, exponential relative risk; CI, confidence interval; TKA, total knee arthroplasty; NIS, National Inpatient Sample