Table VI.

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

Variable	PE model		p-value*	Combined VTE model		p-value*
	Exp RR	95% CI		Exp RR	95% CI
Simultaneous bilateral TKA	4.26	2.13 to 8.52	< 0.0001	3.38	1.96 to 5.84	< 0.0001
NIS VTE score (per 10 points)†	1.12	1.06 to 1.16	< 0.0001	1.09	1.05 to 1.14	< 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