Health behaviors influencing depressive symptoms in older Koreans living alone: secondary data analysis of the 2014 Korean longitudinal study of aging

Table 3 Result of multiple linear regression with interaction term

	Variables	Adj. R²	Δ R²	B	SE	β	p value
Step 1	Sociodemographic factors	0.068^***	0.068^***
	Aged at 75-84^a			0.807	0.005	0.068	< 0.001
	Aged over 85^a			1.629	0.008	0.076	< 0.001
	Gender^b			0.053	0.005	0.005	< 0.001
	Low socioeconomic status^c			1.427	0.004	0.127	< 0.001
Step 2	Health behaviors	0.104^***	0.035^***
	Active smoking			0.371	0.007	0.020	< 0.001
	Alcohol drinking			−1.307	0.005	−0.104	< 0.001
	Physical inactivity			0.614	0.005	0.051	< 0.001
	Social inactivity			1.957	0.005	0.158	< 0.001
Step 3	Living arrangement	0.109^***	0.005^***	0.916	0.005	0.080	< 0.001
Step 4	Active smoking × Living arrangement	0.112^***	0.003^***	0.199	0.002	0.035	< 0.001
	Alcohol drinking × Living arrangement			0.081	0.002	0.015	< 0.001
	Physical inactivity × Living arrangement			−0.001	0.002	0.000	0.678
	Social inactivity × Living arrangement			−0.180	0.002	−0.034	< 0.001

^aReferent group = aged at 65–74; ^bReferent group = male; ^cReferent group = middle level of socioeconomic status; ^*** p < 0.001

ISSN: 1471-2318