Table 3.

Subgroup analyses for the effect of having dinner companions on BMI, stratified by age, gender, household income, educational level and occupation, according to multiple linear regression model, among Korean adults, aged 20 years or over, from the Korean Health and Nutrition Examination Survey VI (2013–2015)^*

	With family			With others			Alone
	BMI (kg/m2)			BMI (kg/m2)			BMI (kg/m2)
Variable	β	se	P value	β	se	P value	β
Age (years)
20–29	−1·15	0·31	<0·01	−1·03	0·30	<0·01	Ref.
30–39	−0·78	0·31	0·01	−0·18	0·33	0·58	Ref.
40–49	0·08	0·19	0·68	0·55	0·29	0·06	Ref.
50–59	−0·16	0·17	0·33	0·01	0·26	0·97	Ref.
60–69	0·19	0·20	0·34	0·26	0·34	0·44	Ref.
70+	−0·74	0·22	<0·01	−0·16	0·45	0·73	Ref.
Gender
Boys	−0·56	0·17	<0·01	−0·41	0·20	0·04	Ref.
Girls	−0·31	0·12	0·01	0·11	0·22	0·61	Ref.
Household income
Q1 (low)	−0·70	0·22	<0·01	−0·04	0·35	0·90	Ref.
Q2	−0·13	0·17	0·46	0·04	0·24	0·88	Ref.
Q3	−0·41	0·16	0·01	−0·01	0·21	0·96	Ref.
Q4 (high)	−0·08	0·15	0·60	0·13	0·19	0·48	Ref.
Educational level
Middle school or less	−0·20	0·13	0·14	−0·13	0·24	0·60	Ref.
High school	−0·28	0·15	0·06	−0·04	0·19	0·85	Ref.
College or over	−0·40	0·16	0·01	0·01	0·19	0·96	Ref.
Occupation
White collar	−0·21	0·18	0·24	0·13	0·21	0·54	Ref.
Pink collar	−0·31	0·22	0·16	0·19	0·27	0·49	Ref.
Blue collar	−0·11	0·17	0·51	0·17	0·23	0·46	Ref.
Unemployed	−0·37	0·13	0·01	−0·44	0·25	0·08	Ref.

Ref., reference category.

^*Complex study design, including survey weights, was considered. The results were adjusted for covariates used in Table 2.