| No | Composites of patient safety culture | Item | Scale |
| 1 | Communication openness | 3 | 5 points Likert (always to never) |
| 2 | Feedback and communication about error | 3 | 5 points Likert (always to never) |
| 3 | Frequency of events reported | 3 | 5 points Likert (always to never) |
| 4 | Handoffs and transitions | 4 | 5 points Likert (strongly agree to strongly disagree) |
| 5 | Management support for patient safety | 3 | 5 points Likert (strongly agree to strongly disagree) |
| 6 | Nonpunitive response to error | 3 | 5 points Likert (strongly agree to strongly disagree) |
| 7 | Organizational learning―continuous improvement | 3 | 5 points Likert (strongly agree to strongly disagree) |
| 8 | Overall perceptions of patient safety | 4 | 5 points Likert (strongly agree to strongly disagree) |
| 9 | Staffing | 4 | 5 points Likert (strongly agree to strongly disagree) |
| 10 | Supervisor/manager expectations and actions promoting safety | 4 | 5 points Likert (strongly agree to strongly disagree) |
| 11 | Teamwork across units | 4 | 5 points Likert (strongly agree to strongly disagree) |
| 12 | Teamwork within units | 4 | 5 points Likert (strongly agree to strongly disagree) |