Variable name	Classification	Ratio (%)
Gender	Male	51.37
Gender	Female	40.89
Age	60 - 65	42.62
	66 - 70	28.42
	71 - 75	14.75
	76 - 80	10.38
	>80	3.83
Education	Junior high school and below	29.51
	High School	38.80
	College	27.32
	Master or above	4.37
Number of children	None	10.93
	One	55.19
	Two and more	43.72
Physical status	Very bad, totally need to be cared for	4.37
	Poor, it needs someone to take care of it	12.57
	OK, sometimes need to be cared for	37.7
	Better, hardly need any care	30.05
	Very good, do not need others to take care of, can also take care of others	15.3
Economic status	Retirement salary	46.45
	Children’s subsidies	16.94
	Government funding	38.79
	Other	5.46
Sleep quality	Very bad	6.01
	Sometimes good, sometimes bad	69.95
	Fine	24.04
Residence condition	Living alone	7.1
	Living with a spouse or children	78.69
	Other	14.21