Table 3.

The regression coefficient (b) for control variables, the number of close friends, self-rated health, and age by the number of close friend interactions with the total explained variances (R^∧2) for each age group.

	b
Variables	Young	Middle-aged	Older
Age	−0.021***	−0.002	0.027***
Sex	0.138***	0.076**	0.072**
Monthly income	0.000	0.000	0.000
Highest educational qualification	0.073*	0.093***	0.043
Marital status	0.346***	0.354***	0.290***
Residence	0.114**	0.082**	0.035
Self-rated health	0.428***	0.431***	0.3666***
The number of close friends	0.018***	0.008***	0.004**
R∧2	0.107	0.133	0.111

^*p < 0.05,

^**p < 0.01,

^***p < 0.001.

All numbers were rounded up to three digits.