Table 1.

Variable descriptions.

Type	Variables	Variable definitions
Dependent variable	Depression	0–30, the lower the score, the less depressed you are
Independent variable	Intergenerational care	0 = no intergenerational care; 1 = with intergenerational care
	Intergenerational care time	0.5-208,the smaller the variable, the shorter the time to provide intergenerational care
Intermediate variable	Social activities	0 = no social activity; 1 = with social activity
Control variable	Gender	0 = female; 1 = male
	Age	60–108 years
	Education level	0 = no education; 1 = primary education; 2 = secondary education; 3 = tertiary education
	Marital status	0 = no spouse; 1 = with spouse
	Living arrangements	0 = not living with children; 1 = living with children
	Financial support from son to father	0 = no financial support; 1 = with financial support
	Financial support from father to son	0 = no financial support; 1 = with financial support
	Satisfaction with relationship with children	0 = unsatisfied;1 = satisfied
	Health satisfaction	0 = unsatisfied;1 = satisfied