Table 3.

Logistic regression model for combined complication risk (inpatient plus outpatient)

	Cardiac complication			Pulmonary embolism			Knee infection
Variable	Odds ratio	95%CI	p-value	Odds ratio	95%CI	p-value	Odds ratio	95%CI	p-value
Group (simultaneous BTKA vs. unilateral TKA)	1.7	1.4–2.2	< 0.001	1.5	1.1–2.0	0.01	0.8	0.5–1.2	0.3
Sex (male vs. female)	1.3	1.2–1.4	< 0.001	0.8	0.7–0.9	< 0.001	1.6	1.4–1.9	< 0.001
Age group (≥ 75 vs. < 75)	2.4	2.2–2.6	< 0.001	1.4	1.2–1.6	< 0.001	1.0	0.9–1.2	0.6
Charlson-based comorbidity present (yes vs. no)	3.4	3.0–3.8	< 0.001	1.9	1.5–2.3	< 0.001	1.9	1.5–2.3	< 0.001
TKA volume of facility (quartile 1 vs. quartile 4)	0.8	0.7–1.0	0.1	0.6	0.4–0.8	< 0.001	1.0	0.7–1.3	0.9