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 1 Structure of postgastrectomy syndrome assessment scale-45

Domains	Subdomains		Items		Subscales
QOL	SF-8 (QOL)	1	Physical functioning1	Five or six-point Likert scale	Physical component summary1
		2	Role physical1		Mental component summary1
		3	Bodily pain1
		4	General health1
		5	Vitality1
		6	Social functioning1
		7	Role emotional1
		8	Mental health1
Symptoms	GSRS	9	Abdominal pains	Seven-point Likert scale	Esophageal reflux subscale (item 10, 11, 13, 24)
	symptoms	10	Heartburn	Except item 29 and 32	Abdominal pain subscale (item 9, 12, 28)
		11	Acid regurgitation		Meal-related distress subscale (item 25-27)
		12	Sucking sensations in the epigastrium		Indigestion subscale (item 14-17)
		13	Nausea and vomiting		Diarrhea subscale (item 19, 20, 22)
		14	Borborygmus		Constipation subscale (item 18, 21, 23)
		15	Abdominal distension		Dumping subscale (item 30, 31, 33)
		16	Nausea and vomiting
		17	Increased flatus		Total symptom scale (above seven subscales)
		18	Decreased passage of stools
		19	Increased passage of stools
		20	Loose stools
		21	Hard stools
		22	Urgent need for defecation
		23	Feeling of incomplete evacuation
	PGSAS original	24	Bile regurgitation
	symptoms	25	Sense of foods sticking
		26	Postprandial fullness
		27	Early satiation
		28	Lower abdominal pains
		29	Number and type of early dumping symptoms
		30	Early dumping general symptoms
		31	Early dumping abdominal symptoms
		32	Number and type of late dumping symptoms
		33	Late dumping symptoms
Living status	Meals (amount) 1	34	Ingested amount of food per meal1		-
		35	Ingested amount of food per day1
		36	Frequency of main meals
		37	Frequency of additional meals
	Meals (quality)	38	Appetite1	Five-point Likert scale	Quality of ingestion subscale1 (item 38-40)
		39	Hunger feeling1
		40	Satiety feeling1
	Meals (amount) 2	41	Necessity for additional meals	Five-point Likert scale	-
	Social activity	42	Ability for working	Five-point Likert scale	-
QOL	Dissatisfaction (QOL)	43	Dissatisfaction with symptoms	Five-point Likert scale	Dissatisfaction for daily life subscale (item 43-45)
		44	Dissatisfaction at the meal
		45	Dissatisfaction at working

In items or subscales without¹, higher score indicating worse condition; in items or subscales with¹, higher score indicating better condition. Each subscale is calculated as the mean of composed items or subscales, except physical component summary and mental component summary of SF-8. Item 29 and 32 don't have score. Then, they were analyzed separately.