Table 5

Logistic regression analysis for nodding off at the wheel in the last 3 years

Variable B Wald test p value Odds ratio Lower 95% CI Upper 95% CI
Epworth score0.1922.6<0.000011.211.121.31
Tracking error0.130.43>
Reaction time0.040.11>
Off-road events/h0.00080.04>0.051.00080.991.001
  • RDI = respiratory disturbance index.

  • 5-150 OR for every 1 unit increase in variable (i.e. estimated risk of nodding off at the wheel increases by 1.21 for every increase in Epworth score by 1)