Factors affecting the quality of life of patients after gastrectomy as assessed using the newly developed PGSAS-45 scale: A nationwide multi-institutional study

Table 5 Clinical factors affecting quality of life in the patients after each of total or distal gastrectomy (Subgroup Multiple Regression Analysis)

	Dissatisfaction for daily life SS		Physical component summary1		Mental component summary1
	β	P value	β	P value	β	P value
TG
Age	-0.135	0.0007	-0.160	0.0006	0.118	0.0141
Sex (male)	(0.003)	NS	(0.065)	NS	(-0.074)	NS
Period after gastrectomy	(-0.036)	NS	(0.029)	NS	(-0.054)	NS
Total symptoms score	0.428	< 0.0001	-0.441	< 0.0001	-0.350	< 0.0001
Change in body weight1	(-0.001)	NS	(0.020)	NS	(-0.034)	NS
Necessity for additional meals	0.281	< 0.0001	(0.085)	0.0653	(-0.028)	NS
Ability for working	0.335	< 0.0001	-0.334	< 0.0001	-0.415	< 0.0001
R2 (P value)	0.565	< 0.0001	0.434	< 0.0001	0.393	< 0.0001
DG
Age	(-0.081)	0.0001	(-0.018)	NS	(0.081)	0.0029
Sex (male)	(0.025)	NS	(0.036)	NS	(0.052)	0.0502
Period after gastrectomy	(-0.027)	NS	(-0.033)	NS	(0.011)	NS
Total symptoms score	0.441	< 0.0001	-0.316	< 0.0001	-0.355	< 0.0001
Change in body weight1	(-0.044)	0.0265	(0.024)	NS	(0.006)	NS
Necessity for additional meals	0.139	< 0.0001	(0.043)	NS	(-0.019)	NS
Ability for working	0.377	< 0.0001	-0.390	< 0.0001	-0.289	< 0.0001
R2 (P value)	0.598	< 0.0001	0.347	< 0.0001	0.322	< 0.0001
If βis 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.
The interpretation of effect size	β	R2
None-very small	< (0.100)	< (0.020)
Small	≥ 0.100	≥ 0.020
Medium	≥ 0.300	≥ 0.130
Large	≥ 0.500	≥ 0.260

Outcome measures with¹, higher score indicating better condition; outcome measures without¹, higher score indicating worse condition. TG: Total gastrectomy; DG: Distal gastrectomy.