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. 2007 Dec 1;30(12):1801–1807. doi: 10.1093/sleep/30.12.1801

Table 4.

Relationship Between Drowsy Driving and Decreased Vigilance on Duty

Vigilance on duty Shifts with drowsy driving, no. (%) OR P Value
Struggled to stay awake
    No 1611 (18.2) 1.00
    Yes 1299 (57.7) 3.37 < 0.001
Fell asleep
    No 2717 (25.6) 1.00
    Yes 183 (41.4) 1.31 0.02

OR refers to odds ratio.