Table 3.

Comparison of in-hospital postoperative complications that were not increased after primary knee arthroplasty between morbidly obese and nonobese patients

Postoperative complications	Primary TKA
	Nonobese (n = 90,442)	Morbidly obese (n = 90,143)	OR (95% CI)
Cardiac	642 (0.70%)	683 (0.75%)	1.0 (0.9–1.1)
Peripheral vascular	197 (0.21%)	154 (0.17%)	0.7 (0.6–0.9)*
Respiratory	721 (0.79%)	515 (0.57%)	0.7 (0.6–0.8)*
Gastrointestinal	377 (0.41%)	374 (0.41%)	0.9 (0.8–1.1)
Central nervous system	60 (0.06%)	60 (0.06%)	1.0 (0.7–1.4)
Hematoma/seroma	701 (0.77%)	664 (0.73%)	0.9 (0.8–1.0)
Deep vein thrombosis	404 (0.44%)	349 (0.38%)	0.8 (0.7–1.0)
Pulmonary embolism	407 (0.45%)	357 (0.39%)	0.8 (0.7–1.0)

* p < 0.05; OR = odds ratio; CI = confidence interval.