Table 5.

The result of logistic and linear regression analyses in TKA

	Transfusion rate		PLOS
	OR (95% CI)	P	B (95% CI)	P	B′
Crude model	2.461 (2.010–3.013)	0.000	1.214 (1.016–1.412)	0.000	0.153
Model 1	2.561 (2.090–3.139)	0.000	1.223 (1.025–1.422)	0.000	0.154
Model 2	2.529 (2.052–3.116)	0.000	1.492 (1.290–1.694)	0.000	0.188
Model 3	2.812 (2.224–3.554)	0.000	1.099 (0.879–1.318)	0.000	0.139

PLOS postoperative length of stay

Model 1: Controlled for age, gender, body mass index, MI, 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 Society of Anesthesiologists class, operative time, intraoperative bleeding, tranexamic acid, and tourniquet use