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Relationship Between Shift Duration and Drowsy Driving
| Hours worked | Shifts with drowsy driving |
OR (95% CI) | P Value | |
|---|---|---|---|---|
| No. | % | |||
| ≤ 8.5 | 203 | 15.7 | 1.00 | |
| > 8.5 - < 12.5 | 923 | 22.3 | 1.35 (1.03–1.77) | 0.028 |
| ≥ 12.5 | 1793 | 31.3 | 2.00 (1.61–2.32) | < 0.0001 |
OR refers to odds ratio; CI, confidence interval.
