Defecation disorders are crucial sequelae that impairs the quality of life of patients after conventional gastrectomy

Table 5 The effects of defecation disorder symptoms on the living status and quality of life after total and distal gastrectomy (multiple regression analysis)

		TG (n = 393)						DG (n = 1384)
		Diarrhea SS		Constipation SS				Diarrhea SS		Constipation SS
		β	P value	β	P value	R2	P value	β	P value	β	P value	R2	P value
Living status	Change in BW	-0.003	0.960	-0.052	0.359	0.003	0.613	-0.061	0.034	-0.039	0.170	0.006	0.017
	Ingested amount of food per meal	0.087	0.113	-0.182	0.001	0.030	0.004	-0.150	< 0.001	-0.183	< 0.001	0.069	< 0.001
	Necessity for additional meals	-0.060	0.270	0.147	0.008	0.019	0.027	0.111	< 0.001	0.182	< 0.001	0.055	< 0.001
	Quality of ingestion SS	0.058	0.292	-0.177	0.001	0.028	0.006	-0.080	0.004	-0.138	< 0.001	0.030	< 0.001
	Ability for working	-0.071	0.189	0.275	< 0.001	0.068	< 0.001	0.122	< 0.001	0.260	< 0.001	0.097	< 0.001
QOL	Dissatisfaction with symptoms	0.100	0.055	0.276	< 0.001	0.105	< 0.001	0.257	< 0.001	0.244	< 0.001	0.155	< 0.001
	Dissatisfaction at the meal	0.012	0.813	0.275	< 0.001	0.078	< 0.001	0.266	< 0.001	0.269	< 0.001	0.176	< 0.001
	Dissatisfaction at working	0.066	0.205	0.292	< 0.001	0.102	< 0.001	0.234	< 0.001	0.237	< 0.001	0.137	< 0.001
	Dissatisfaction for daily life SS	0.067	0.189	0.338	< 0.001	0.134	< 0.001	0.297	< 0.001	0.294	< 0.001	0.216	< 0.001
	PCS of SF-8	-0.058	0.258	-0.323	< 0.001	0.120	< 0.001	-0.140	< 0.001	-0.242	< 0.001	0.094	< 0.001
	MCS of SF-8	-0.147	0.005	-0.227	< 0.001	0.096	< 0.001	-0.214	< 0.001	-0.244	< 0.001	0.130	< 0.001

Integrated subscales are italicized in the table. The interpretation of effect size, standardization coefficient of regression (β): Small, ≥ 0.1; medium, ≥ 0.3; large, ≥ 0.5. The interpretation of effect size, coefficient of determination (R²): Small, ≥ 0.02; medium, ≥ 0.13; large, ≥ 0.26. QOL: Quality of life. SS: Subscale; BW: Body weight; PCS: Physical component summary; MCS: Mental component summary.