General participant characteristics
| Ships (n=146) | Submarines (n=98) | Total (n=244) | |
| Mean (SD)/Median (range) | Mean (SD)/Median (range) | Mean (SD)/Median (range) | |
| Age (years) | 30.70 (8.16)/29 (19–48) | 29.61 (6.92)/27 (21–46) | 30.26 (7.69)/29 (19–48) |
| Frequency (%) | Frequency (%) | Frequency (%) | |
| Sex | |||
| Men | 140 (95.9%) | 238 (97.5%) | 238 (97.5%) |
| Women | 6 (4.1%) | 6 (2.5%) | 6 (2.5%) |
| Marital status | |||
| Single | 79 (54.1%) | 134 (54.9%) | 134 (54.9%) |
| Married | 67 (45.9%) | 110 (45.1%) | 110 (45.1%) |
| Religion | |||
| No religion | 79 (54.1%) | 46 (46.9%) | 125 (51.2%) |
| Having religion | 67 (45.9%) | 52 (53.1%) | 119 (48.8%) |
| Duration of service (months) | 12.96 (9.77) | 17.66 (15.45) | 14.85 (12.56) |
| Over work hours (>40 hours/week) | |||
| No over work hours | 104 (71.2%) | 51 (52%) | 155 (63.5%) |
| Over work hours | 42 (28.8%) | 47 (48%) | 89 (36.5%) |