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Table 1 Demographic and work characteristics of Daily two shift and Alternating day shift bus drivers

From: Sleepiness while driving and shiftwork patterns among Korean bus drivers

Variables Daily two shift
(n = 128)
Alternating day shift
(n = 204)
p-value
N (%) or M ± SD N (%) or M ± SD
Age (years)
  < 40 14 (10.9) 29 (14.2) <0.0001
 40–49 51 (39.8) 61 (29.9)  
 50–59 44 (34.4) 110 (53.9)  
  ≥ 60 19 (14.8) 4 (2.0)  
 M ± SD 49.8 ± 8.7 48.9 ± 7.4 0.3388
Job duration (years)
  < 10 47 (36.7) 117 (57.4) 0.0012
 10–20 56 (43.8) 58 (28.4)  
  ≥ 20 25 (19.5) 29 (14.2)  
 M ± SD 13.6 ± 8.5 9.5 ± 7.2 <0.0001
Body mass index (kg/m2)
  < 25 72 (56.3) 138 (67.7) 0.0360
  ≥ 25 56 (43.8) 66 (32.4)  
Alcohol consumption
 Non-drinker 41 (32.0) 63 (30.9) 0.6450
  < 3 times/week 49 (38.3) 88 (43.1)  
  ≥ 3 times/week 38 (29.7) 53 (26.0)  
History of disease
 Hypertension 42 (32.8) 52 (25.5) 0.1495
 Diabetes 11 (8.6) 24 (11.8) 0.3598
Number of workdays in the past month 23.6 ± 1.4 15.1 ± 1.6 <0.0001
Working hours
 Daily working hours 10.2 ± 1.2 19.4 ± 1.3 <0.0001
 Weekly working hours 56.0 ± 7.6 68.2 ± 7.2 <0.0001
 Daily driving hours 8.4 ± 1.1 17.1 ± 1.6 <0.0001
 Weekly driving hours 46.5 ± 6.3 60.0 ± 6.7 <0.0001
  1. M Mean, SD Standard deviation