Independent variable

Assignment method

Age

18 - 40 = 1; 41 - 60 = 2; >60 = 3;

Education level

Primary school and below = 1; Junior middle school = 2; Senior high school = 3; Secondary specialized school and College for professional training = 4; Bachelor degree = 5; Master degree and above = 6

Place of residence

Village = 1; Town = 2; City = 3

Length of stay

≤9 days = 1; 10 - 30 days = 2; ≥31 days = 3

Have any chronic diseases

Yes = 1; No = 0

A stable job

Yes = 1; No = 0

Family income per capita/yuan

<2000 yuan = 1; 2000 - 6000 yuan = 2; 6000 - 10,000 yuan = 3; >10,000 = 4

Any experience in caregiving

Yes = 1; No = 0