Background factors influencing postgastrectomy syndromes after various types of gastrectomy

Table 8 Multiple regression analysis exploring independent factors affecting the Postgastrectomy Syndrome Assessment Scale scores for local resection of stomach

	Postop period		Age		Sex [female]		Approach [laparo]
MOMs	β1	P	β	P	β	P	β	P	R22	P
Esophageal reflux SS									0.048	> 0.10
Abdominal pain SS			-0.3474	0.00124	0.194	0.0695			0.1604	0.00694
Meal-related distress SS									0.037	> 0.10
Indigestion SS									0.031	> 0.10
Diarrhea SS			-0.218	0.0481					0.072	> 0.10
Constipation SS									0.027	> 0.10
Dumping SS									0.008	> 0.10
Total symptom score									0.035	> 0.10
Change in BW									0.095	> 0.10
Ingestion amount of food									0.001	> 0.10
Need of additional food									0.051	> 0.10
Quality of ingestion SS	0.3044	0.00764	-0.2153	0.04373					0.1674	0.00664
Ability for working	-0.2213	0.05143							0.1163	0.04103
Dissatisfaction: symptom									0.036	> 0.10
Dissatisfaction: meal									0.038	> 0.10
Dissatisfaction: working									0.078	> 0.10
Dissatisfaction SS									0.037	> 0.10
PCS of SF-8									0.056	> 0.10
MCS of SF-8			0.229	0.0386					0.083	> 0.10

¹β: standardized regression coefficient. If β is positive, then the score of the main outcome measures (MOMs) of the patient in the category in [brackets] is higher when the factor has a nominal scale, and the score of the MOMs of the patient with a larger value is higher when the factor has a numeric scale;

²R²: coefficient of determination;

³Significantly independent factors with a small effect size;

⁴Significantly independent factors with a medium effect size. Change in body weight, ingestion amount of food, quality of ingestion subscale, physical component summary, and mental component summary indicate higher scores (i.e., better conditions). Other outcome measures indicate higher scores (i.e., worse conditions). Interpretation of effect size: None or very small (β < 0.100, R² < 0.020); Small (β ≥ 0.100, R² ≥ 0.020); Medium (β ≥ 0.300, R² ≥ 0.130); Large (β ≥ 0.500, R² ≥ 0.260). MOMs: Main outcome measures; SS: Subscale; PCS: Physical component summary; MCS: Mental component summary; BW: Body weight; postop: Postoperative; laparo: Laparoscopic.