Table 2.

Variables and indicators.

Variable	Definition	Description
CESDscore	Depression self-rating scale score	The higher the score, the worse the mental health status
Gender	Gender	Female = 0, male = 1
Age	Age	45–55 years old = 0, 56–65 years old = 1, 66–75 years old =2, 75 years old and above =3
Edu	Education level	Illiterate = 0, elementary = 1, middle school and above = 2
Marriage	Marital Status	Divorced or widowed = 0, married = 1. Single = 2
Residence	Nature of permanent residence	Rural residence = 0, urban residence = 1
Fall	Has fallen in the last two years	No = 0, Yes = 1
ADL	Long-term living capacity impairment	No = 0, Yes = 1
lgPCE	Annual household expenditure per capita	Logarithm, RMB