. 2018 Mar 20;16:44. doi: 10.1186/s12916-018-1025-7

Table 2.

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

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)
Apnea-hypopnea index – per 10 events/hour	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)
Usual sleep duration – per hour less sleep	P = 0.04	P < 0.01
Excessive daytime sleepiness (Epworth Sleepiness Scale score ≥ 11)	1.54 (1.15, 2.07)	–
	P < 0.01	–

Values are odds ratio (95% confidence interval), adjusted for age, sex, and miles driven per year

^*Absence of excessive sleepiness defined as Epworth Sleepiness Scale Score ≤ 10