Table 3. Regression analysis of Hb loss (g/dL).

Variable	Univariable				Multivariable
	Regression coefficient	95% CI	P value		Regression coefficient	95% CI	P value
Continuous1
Age (years)	0.0	(0.0 to 0.0)	0.145		0.0	(0.0 to 0.0)	0.177
BMI (kg/m2)	0.0	(−0.1 to 0.0)	0.328		0.0	(−0.1 to 0.0)	0.113
Preoperative Hb (g/dL)	0.4	(0.2 to 0.5)	<0.001		0.4	(0.2 to 0.6)	<0.001
Catagorical2
Gender (male vs. female)	0.7	(0.3 to 1.1)	<0.001		0.2	(−0.3 to 0.7)	0.398
Anticoagulant (yes vs. no)	0.1	(−0.4 to 0.6)	0.693		0.0	(−0.5 to 0.5)	0.907
Tourniquet (yes vs. no)	0.0	(−0.5 to 0.4)	0.842		0.0	(−0.4 to 0.4)	0.991
Anesthesia (regional vs. general)	−0.3	(−0.8 to 0.1)	0.166		−0.1	(−0.5 to 0.3)	0.710
Drain placement (yes vs. no)	0.3	(−0.2 to 0.7)	0.246		0.4	(0.0 to 0.8)	0.044
TXA (yes vs. no)	−0.5	(−0.9 to 0.1)	0.029		−0.9	(−1.4 to 0.4)	<0.001

¹, Regression coefficient represents the expected difference in Hb loss for an increase of the independent variable by one unit; ², Regression coefficient represents the expected difference in Hb loss for the specified binary category. BMI, body mass index; Hb, hemoglobin; TXA, tranexamic acid.