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Table 1 Baseline characteristics of the study sample

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

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
  1. 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)
  2. MVC motor vehicle crash
  3. *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)
  4. 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)