Independent variable

Assignment method

Gender

Male = 1; Female = 2

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

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

Score of caregiver burden

Original value