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Table 2 Relation of sleep apnea, sleep duration, and self-reported sleepiness to motor vehicle crash risk

From: Sleep deficiency and motor vehicle crash risk in the general population: a prospective cohort study

Characteristic All participants (n = 3201) Participants without excessive sleepiness* (n = 2402)
Apnea-hypopnea index – per 10 events/hour 1.15 (1.04, 1.26) 1.17 (1.02 1.33)
P < 0.01 P = 0.02
Usual sleep duration – per hour less sleep 1.13 (1.01, 1.28) 1.22 (1.05, 1.43)
P = 0.04 P < 0.01
Excessive daytime sleepiness (Epworth Sleepiness Scale score ≥ 11) 1.54 (1.15, 2.07)
P < 0.01
  1. Values are odds ratio (95% confidence interval), adjusted for age, sex, and miles driven per year
  2. *Absence of excessive sleepiness defined as Epworth Sleepiness Scale Score ≤ 10