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 6 Influence of various symptoms on patients' living status and quality of life (Multiple regression analysis)

	Change in body weight1		Necessity for additional meals		Ability for working		Dissatisfaction for daily life SS		Physical component summary1		Mental component summary1
	β	P value	β	P value	β	P value	β	P value	β	P value	β	P value
Esophageal reflux SS	(-0.04)	NS	(0.052)	NS	(0.081)	0.0126	(0.085)	0.0011	-0.126	< 0.0001	(-0.085)	0.0062
Abdominal pain SS	(0.042)	NS	(-0.004)	NS	(0.096)	0.0046	0.146	< 0.0001	-0.261	< 0.0001	(-0.094)	0.0039
Meal-related distress SS	-0.170	< 0.0001	0.279	< 0.0001	0.116	0.0012	0.282	< 0.0001	(-0.074)	0.0263	-0.144	< 0.0001
Indigestion SS	(-0.036)	NS	(0.004)	NS	(-0.001)	NS	(0.015)	NS	(0.024)	NS	(-0.058)	0.0699
Diarrhea SS	(0.023)	NS	(-0.037)	NS	(-0.076)	0.0061	(0.011)	NS	(0.022)	NS	(-0.054)	0.0441
Constipation SS	(0.062)	0.0431	(0.007)	NS	(0.093)	0.0008	(0.006)	NS	(-0.037)	NS	(-0.056)	0.0356
Dumping SS	(-0.051)	NS	0.113	0.0015	0.214	< 0.0001	0.283	< 0.0001	-0.168	< 0.0001	-0.141	< 0.0001
R2 (P value)	0.040	< 0.0001	0.148	< 0.0001	0.202	< 0.0001	0.483	< 0.0001	0.276	< 0.0001	0.240	< 0.0001
If βis positive, the score of outcome measure of the patients with larger values is higher
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

¹Outcome measures with, higher score indicating better condition; outcome measures without, higher score indicating worse condition.