| Research variables | Assignment |
| Safety culture score | Continuous variable | Age group | 1 = ≤25 year, 2 = 26–35 year, 3 = 36–45 year, 4 ≥ 45 year | Length of service in the operating room | 1 = ≤3 year, 2 = 4–10 year, 3 ≥ 10 year | Mode of employment | 1 = Contract system, 2 = Fixed establishment | Initial education | 1 = Secondary specialized school, 2 = Junior college, 3 = Bachelor degree or above | Final education | 1 = Secondary specialized school, 2 = Junior college, 3 = Bachelor degree or above | Post | 1 = Nurse practitioner, 2 = Teaching teacher, 3 = Head nurse and above | Title | 1 = Nurse, 2 = Nurse practitioner, 3 = Nurse in charge, 4 = Deputy chief nurse and above | Marital status | 1 = Unmarried, 2 = Married, 3 = Divorce or separation | Night shifts | 0 = No, 1 = Yes | Weekly overtime hours | 1 = No overtime, 2 = ≤5 hours, 3 = 6–10 hours, 4 ≥ 10 | Score of adverse event scale | Continuous variable |
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