Table 3.

The results of logistic and liner regression analyses in routine primary TKA

Variables	Transfusion rate		PLOS
	RR (95%CI)	P value	B (95%CI)	P value
Crude model	2.458 (1.962–3.081)	0.000	1.280 (1.066–1.494)	0.000
Model 1	2.604 (2.075–3.267)	0.000	1.294 (1.080–1.508)	0.000
Model 2	2.319 (1.841–2.922)	0.000	1.278 (1.061–1.495)	0.000
Model 3	1.888 (1.449–2.461)	0.000	0.923 (0.690–1.156)	0.000

PLOS postoperative length of stay

Model 1: controlled for age, gender, body mass index and diagnoses

Model 2: controlled for model 1 + hypertension, type 2 diabetes, chronic obstructive pulmonary disease, coronary heart disease, preoperative analgesic use, hemoglobin and albumin

Model 3: controlled for model 2 + method of anesthesia, American Standards Association class, operative time, intraoperative bleeding, tranexamic acid and drain use