Type of variables
| Variables | Type |
| PTE | Exposure |
| Sex | Effect modification or potential cofounding |
| Age | Effect modification or potential cofounding |
| Years of experience | Potential cofounding |
| Type of job | Effect modification or potential cofounding |
| POPAS | Effect modification or potential cofounding |
| Other PTE occurring during the study | Potential cofounding |
| Medical or psychological support | Effect modification or potential cofounding |
| Perceived stress | Primary outcome and effect modification |
| Post-traumatic stress disorder | Primary outcome (T2–T4) |
| Psychological distress | Secondary outcome |
| Absenteeism and presenteeism | Primary outcome |
| Quality of life at work | Primary outcome |
| Acute stress disorder | Primary outcome (T1) |
| Depression | Secondary outcome |
| Anxiety | Secondary outcome |
| Workplace safety perceptions | Secondary outcome and effect modification |
POPAS, Perception of the Prevalence of Aggression Scale; PTE, potentially traumatic events.