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Influencing factors of PTSD.
| Variable | χ2/t | P |
| Age | 2.809 | 0.005 |
| Job title | 4.845 | 0.028 |
| Job assignment | 0.342 | 0.004 |
| Length of service | 6.892 | 0.009 |
| Average monthly income | 10.195 | 0.001 |
| Number of night shifts per month | 0.531 | 0.011 |
| Number of children | 5.870 | 0.015 |
| NPPBS score | 9.802 | < 0.001 |
| PTGI score | 4.698 | < 0.001 |
