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Table 1 Association of tugboat crewmember characteristics with fatigue categories

From: Long working hours, poor sleep quality, and work-family conflict: determinant factors of fatigue among Indonesian tugboat crewmembers

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%)
  1. * = Mann-Whitney test
  2. ** = χ2 test
  3. *** = Fisher’s exact test
  4. f (%) = Frequency (percentage)