Variable

Assignment

Department

Comprehensive ICU = 1; Specialist ICU = 2

Professional title

Nurse = 1; Nurse practitioner = 2; Supervisor = 3; Deputy chief nurse and above = 4

Position

Nurse = 1; Nursing/Teaching team leader = 2; Head nurse = 3

Frequency of night shift

None = 1; 1 - 4 times/month = 2; 5 - 8 times/month = 3; over 8 times/month = 4

Experience of workplace violence

No = 1; Yes = 2

Score of psychological resilience

Substitution of original value