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 |