Table 3. Linear regression analysis for chest drainage.

Chest tube drainage in the first 24 h/weight	Simple linear regression				Multiple linear regression
	B	p	95% CI		B	P	95% CI
			Lower	Upper			Lower	Upper
BMI group
BMI <24 kg/m2	5.157	<0.001	4.102	6.212	4.840	<0.001	3.696	5.989
24≤ BMI <28 kg/m2	1.987	<0.001	1.002	2.972	1.682	0.002	0.644	2.720
BMI ≥28 kg/m2*
Age	0.092	<0.001	0.051	0.134	0.089	<0.001	0.056	0.123
Diabetes mellitus	1.221	0.004	0.402	2.040
Hyperlipidemia	1.436	<0.001	0.669	2.202
Hypertension	0.797	0.048	0.005	1.589
Atrial fibrillation	−1.602	0.059	−3.267	0.064
Glucose	<0.001	0.214	<0.001	0.001
RBC	−0.890	0.021	−1.645	−0.134
Hb	−0.022	0.069	−0.046	0.002
PLT	−0.008	0.013	−0.014	0.002
Hematocrit	−0.046	0.241	−0.124	0.031

^*BMI ≥28 kg/m² as the control group; R² = 0.784. RBC: red blood cell; Hb: hemoglobin; PLT: platelet; BMI: body mass index; CI: confidence interval