Logistic regression analysis for near miss accidents in the last 3 years
| Variable | B | Wald test | p value | Odds ratio | Lower 95% CI | Upper 95% CI |
| Epworth score | 0.14 | 14.88 | <0.0001 | 1.15 | 1.07 | 1.23 |
| RDI | 0.014 | 2.00 | >0.05 | 1.01 | 0.99 | 1.03 |
| Tracking error | 0.33 | 2.56 | >0.05 | 1.40 | 0.93 | 2.12 |
| Reaction time | 0.11 | 0.74 | >0.05 | 1.12 | 0.87 | 1.44 |
| Off-road events/h | 0.003 | 0.56 | >0.05 | 1.003 | 0.99 | 1.01 |
RDI = respiratory disturbance index.
6-150 OR for every 1 unit increase in variable (i.e. estimated risk of near miss accident increases by 1.15 for every increase in Epworth score by 1).