Table 6.

Assignment method of independent variables.

Independent variable	Assignment method
Age(years)	<20 = 1,20–29 = 2, 30–39 = 3, 40–49 = 4,≥50 = 5
Year(s) working	<3 = 1,3–5 = 2, 6–9 = 3,≥10 = 4
Employment type	Contract = 0, Regular = 1
Professional title	Nurse = 1, Primary Nurse = 2, Nurse-in-charge = 3, Co-chief superintendent nurse = 4, Chief superintendent nurse = 5
Education level	Secondary technical certificate = 1, Associate degree = 2,Bachelor's degree = 3, Master's degree = 4