Predictive factors for body weight loss and its impact on quality of life following gastrectomy

Table 4 Factors influencing body weight loss after gastrectomy (multiple regression analysis)

Variables	Change in body weight
	β	P value
Type of gastrectomy (DGBI)	0.204	< 0.0001
Type of gastrectomy (DGRY)	0.116	< 0.0001
Postoperative period (mo)	(-0.02)	NS
Age (yr)	(-0.04)	0.0746
Gender (male)	0.120	< 0.0001
Preoperative BMI (kg/m2)	-0.3561	< 0.0001
Approach (Laparoscopic)	(0.01)	NS
Celiac branch of vagus (Preserved)	(0.074)	0.0010
R2 (P value)	0.216	< 0.0001
The interpretation of effect size	β	R2
None-very small	< (0.100)	< (0.020)
Small	> 0.100	> 0.020
Medium	> 0.3001	> 0.1301
Large	> 0.500	> 0.260

¹Integrated subscales. Higher score indicative of a better condition. If β is positive, the score of the outcome measure of the patients belonging to the category in (brackets) is higher in cases when the factor is a nominal scale, and the score of outcome measure of the patients with larger values is higher in cases when the factor is a numeral scale. DGBI: Distal gastrectomy with Billroth-I; DGRY: Distal gastrectomy with Roux-en-Y.