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 4 Clinical factors affecting quality of life in the patients after gastrectomy (Multiple Regression Analysis)

	Dissatisfaction for daily life SS		Physical component summary1		Mental component summary1
	β	P value	β	P value	β	P value
Type of gastrectomy [TG]	(0.047)	0.0132	(0.008)	NS	(-0.056)	0.0238
Age	(-0.091)	< 0.0001	(-0.052)	0.0236	(0.090)	0.0002
Sex [Male]	(-0.016)	NS	(0.043)	0.0576	(0.025)	NS
Period after gastrectomy	(-0.026)	NS	(-0.019)	NS	(-0.004)	NS
Total symptoms score	0.429	< 0.0001	-0.354	< 0.0001	-0.357	< 0.0001
Change in body weight1	(-0.036)	0.0551	(0.026)	NS	(-0.008)	NS
Necessity for additional meals	0.176	< 0.0001	(0.057)	0.0206	(-0.020)	NS
Ability for working	0.360	< 0.0001	-0.377	< 0.0001	-0.321	< 0.0001
R2 (P value)	0.606	< 0.0001	0.368	< 0.0001	0.333	< 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.