Table 1 Association of tugboat crewmember characteristics with fatigue categories
Variable | Fatigue; f (%) | p-value | |
|---|---|---|---|
Yes | No | ||
Age (median; min-max. in years) | 28; 20–61 | 29; 20–56 | 0.76* |
Marital status | |||
- No | 30 (46.2%) | 35 (53.8%) | 0.16** |
- Yes | 21 (33.9%) | 41 (66.1%) | |
Smoking status | |||
- Medium smoker | 9 (42.9%) | 12 (57.1%) | 0.60** |
- Light smoker | 25 (42.4%) | 34 (57.6%) | 0.52** |
- Non-smoker | 17 (36.2%) | 30 (63.8%) | Reference |
Caffeine consumption | |||
- > 2 cups/day | 5 (35.7%) | 9 (64.3%) | 1.00*** |
- 1–2 cups/day | 25 (46.3%) | 29 (35.7%) | 0.25** |
- None | 21 (35.9%) | 38 (64.4%) | Reference |
Alcohol consumption | |||
- Yes | 17 (58.6%) | 12 (41.4%) | 0.02** |
- No | 34 (34.7%) | 64 (65.3%) | |
Sleep quality | |||
- Poor | 45 (46.9%) | 51 (53.1%) | 0.01** |
- Good | 6 (19.4%) | 25 (80.6%) | |
Work-Family Conflict | |||
- Yes | 35 (54.7%) | 29 (45.3%) | < 0.01** |
- No | 16 (25.4%) | 47 (74.6%) | |
Watch system | |||
- 6/6 | 9 (40.9%) | 13 (59.1%) | 0.94 ** |
- 4/8 | 42 (40.0%) | 63 (60%) | |
Rating | |||
- Officer | 20 (31.7%) | 43 (68.3%) | 0.06 ** |
- Non-Officer | 31 (48.4%) | 33 (51.6%) | |
Duration on board | |||
- < 6 months | 28 (43.1%) | 37 (56.9%) | 0.49** |
- > 6 months | 23 (37.1%) | 39 (62.9%) | |
Length of seafaring experience | |||
- < 6 years | 36 (50.7%) | 35 (49.3%) | 0.01** |
- > 6 years | 15 (26.8%) | 41 (73.2%) | |
Working hours | |||
- > 72 h/week | 40 (65.3%) | 17 (34.7%) | < 0.01** |
- < 72 h/week | 11 (24.4%) | 59 (75.6%) | |