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

Table 1 Baseline characteristics of the study sample

Characteristic	No MVC (n = 2979)^*	MVC (n = 222)^†	P value
Age – years	62.3 (10.1)	61.5 (10.8)	0.22
Male sex – no. (%)	1610 (54.0)	135 (60.8)	0.06
Body mass index – kg/m²	28.2 (4.9)	28.6 (5.6)	0.31
Comorbid illness – no. (%)
Diabetes mellitus	192 (6.7)	15 (7.3)	0.66
Hypertension	1174 (39.4)	83 (37.4)	0.57
Myocardial infarction	186 (6.3)	11 (5.0)	0.34
Stroke	73 (2.5)	5 (2.3)	0.65
Smoking status – no. (%)			0.96
Current	297 (10.0)	21 (9.5)
Former	1367 (46.1)	103 (46.4)
Alcohol consumption – drinks per week	1 (0, 4)	0 (0, 3)	0.88
Caffeine consumption – drinks per day	2 (1, 4)	2 (1, 4)	0.76
Sleeping pill use – no. (%)	1989 (6.7)	19 (8.6)	0.27
Epworth Sleepiness Scale score	7.7 (4.3)	8.6 (4.7)	< 0.01
Apnea-hypopnea index – events per hour	4.3 (1.3, 10.9)	5.5 (1.3, 13.7)	< 0.01
Usual sleep duration – hours per night	7.1 (1.1)	6.9 (1.1)	0.02
Miles driven per year – thousands	9.0 (4.0, 14.0)	11.5 (7.0, 15.0)	< 0.001

Values are number (%) or mean (standard deviation), with the exception of alcohol and caffeine consumption, apnea-hypopnea index, and miles driven, which are median (first quartile, third quartile)
MVC motor vehicle crash
^*Missing data in the sample without MVC: body mass index (n = 4), diabetes (n = 91), myocardial infarction (n = 26), stroke (n = 26), smoking status (n = 16), alcohol consumption (n = 206), sleeping pill use (n = 6)
^†Missing data in the sample with MVC: body mass index (n = 3), diabetes (n = 16), myocardial infarction (n = 1), stroke (n = 1), alcohol consumption (n = 24), sleeping pill use (n = 1)

ISSN: 1741-7015