Table 3.

Multivariate analysis (n = 403)

	P value	B-estimation	SE	Contribution degree
Current BMI (kg/m2)	0.454	0.028	0.037
BMI reduction ratio1 (%)	< 0.001	0.051	0.013	3.948
F/U duration (mo)	0.007	-0.013	0.005	-2.703
OP type
B-I	0.006	-0.714	0.258	-2.770
B-II	0.070	-0.473	0.262
R-Y
Current BMI (kg/m2)	0.478	0.026	0.037
BMI reduction ratio1 (%)	< 0.001	0.052	0.013	4.031
F/U duration (mo)	0.006	-0.013	0.005	-2.727
Extent of gastrectomy
Subtotal (B-I, B-II)	0.011	-0.597	0.234	-2.553
Total (R-Y)
Current BMI (kg/m2)	0.657	0.016	0.037
BMI reduction ratio1(%)	< 0.001	0.054	0.013	4.181
F/U duration (mo)	0.005	-0.013	0.005	-2.811
Duodenal bypass
Bypass – (B-I)	0.039	-0.416	0.202	-2.061
Bypass + (B-II, R-Y)

OP: Operation; BMI: Body mass index; F/U: Follow up; B-I : Billroth I; B-II: Billroth II; R-Y: Roux-en-Y;

¹BMI reduction ratio (%) = -[(Current BMI - Pre-OP BMI)/Pre-OP BMI] × 100.