Gender
1 = male
2 = famale

Age group
1 = <30
2 = 30-39
3 = 40-49
4 = ≥50

Marital status
1 = Single,Divorced or Widowed
2 = Married

Education level
1 = Junior college or below
2 = Bachelor
3 = Master or above

Professional categories
1 = Public health professionals
2 = Nurses
3 = Physicians

Technical title
1 = No title
2 = Primary title
3 = Middle title
4 = Vice-senior title or above

Service years in current position
1 = <5
2 = 5-9
3 = 10-19
4 = 20-29
5 = ≥30

How many hours per week do you work on average
1 = ≤40h
2 = >40h

The number of your monthly night shifts on average in the medical institutions
1 = None
2 = 1-7
3 = ≥8

Type of medical institutions
1 = Community health service centers and township hospitals
2 = Second-class hospitals and above

I have constant time pressure due to a heavy work load
1 = Strongly disagree
2 = Disagree
3 = Agree
4 = Strongly agree

Overall, I am very satisfied with my current job
1 = Highly disagree
2 = Disagree
3 = Somewhat disagree
4 = Somewhat agree
5 = Agree
6 = Highly agree

At my work, I feel that I am bursting with energy
0 = Never
6 = Every day

1 = Poor
2 = Relatively poor
3 = Fair
4 = Relatively good
5 = Good