Table 1.
Characteristics of all participants by level of depression symptoms
| Characteristics | Total, n (%) (N=441) | Severity of depression, n (%) | P value | |
| Normal/mild (n=360) | Moderate/severe (n=81) | |||
| Sailing age*, year | 8.0 (3.0–13.0) | 8.0 (3.0–13.0) | 8.0 (2.0–12.0) | 0.402† |
| Sailing duration*, month | 7.0 (5.0–9.0) | 7.0 (5.0–9.0) | 7.0 (6.0–9.0) | 0.432† |
| Age (years) | ||||
| 18–44 | 323 (73.2) | 265 (82.0) | 58 (18.0) | 0.712‡ |
| ≥45 | 118 (26.8) | 95 (80.5) | 23 (19.5) | |
| Marital status | ||||
| Married | 329 (74.6) | 273 (83.0) | 56 (17.0) | 0.207‡ |
| Others | 112 (25.4) | 87 (77.7) | 25 (22.3) | |
| Educational level | ||||
| High school and below | 236 (53.5) | 192 (81.4) | 44 (18.6) | 0.343‡ |
| Junior college | 172 (39.0) | 139 (80.8) | 33 (19.2) | |
| Bachelor’s degree or above | 33 (7.5) | 29 (87.9) | 4 (12.1) | |
| Income (¥) | ||||
| ≤10 000 | 214 (48.5) | 168 (78.5) | 46 (21.5) | 0.308‡ |
| 10 001–20 000 | 148 (33.6) | 123 (83.1) | 25 (16.9) | |
| 20 001–30 000 | 25 (5.7) | 21 (84.0) | 4 (16.0) | |
| >30 000 | 54 (12.2) | 48 (88.9) | 6 (11.1) | |
| Position class | ||||
| Ordinary crew | 230 (52.2) | 183 (79.6) | 47 (20.4) | 0.269§ |
| Senior officer | 211 (47.8) | 177 (83.9) | 34 (16.1) | |
| Self-rated health | ||||
| Good | 292 (66.2) | 259 (88.7) | 33 (11.3) | <0.001‡ |
| Poor | 149 (33.8) | 101 (67.8) | 48 (32.2) | |
| Chronic disease | ||||
| Yes | 18 (4.1) | 14 (77.8) | 4 (22.2) | 0.755§ |
| No | 423 (95.9) | 346 (81.8) | 77 (18.2) | |
| Smoking status | ||||
| Yes | 201 (45.6) | 160 (79.6) | 41 (20.4) | 0.326§ |
| No | 240 (54.4) | 200 (83.3) | 40 (16.7) | |
| Drinking status | ||||
| Yes | 319 (72.3) | 267 (83.7) | 52 (16.3) | 0.075§ |
| No | 122 (27.7) | 93 (76.2) | 29 (23.8) | |
| LPE per week | ||||
| None | 171 (38.8) | 124 (72.5) | 47 (27.5) | <0.001‡ |
| 1–3 | 192 (43.5) | 165 (85.9) | 27 (14.1) | |
| ≥4 | 78 (17.7) | 71 (91.0) | 7 (9.0) | |
| Sleep duration | ||||
| <6 | 15 (3.4) | 8 (53.3) | 7 (46.7) | 0.008‡ |
| 6–8 | 181 (41.0) | 145 (80.1) | 36 (19.9) | |
| >8 | 245 (55.6) | 207 (84.5) | 38 (15.5) | |
| Sleep quality | ||||
| Poor | 29 (6.6) | 18 (62.1) | 11 (37.9) | <0.001‡ |
| Fair | 214 (48.5) | 163 (76.2) | 51 (23.8) | |
| Good | 198 (44.9) | 179 (90.4) | 19 (9.6) | |
| Overtime work per week | ||||
| None | 256 (58.0) | 224 (87.5) | 32 (12.5) | 0.001‡ |
| 1–2 | 154 (34.9) | 115 (74.7) | 39 (25.3) | |
| ≥3 | 31 (7.1) | 21 (67.7) | 10 (32.3) | |
| Self-perceived work stress | ||||
| Low | 65 (14.7) | 60 (92.3) | 5 (7.7) | <0.001‡ |
| Intermediate | 277 (62.8) | 232 (83.8) | 45 (16.2) | |
| High | 99 (22.5) | 68 (68.7) | 31 (31.3) | |
| COVID-19 stress | ||||
| Low | 54 (12.2) | 44 (81.5) | 10 (18.5) | 0.896‡ |
| Intermediate | 154 (34.9) | 124 (80.5) | 30 (19.5) | |
| High | 233 (52.8) | 192 (82.4) | 41 (17.6) | |
*Data are presented as median (IQR).
†Mann-Whitney rank-sum test conducted for significance testing.
‡Two-tailed χ2 analysis conducted for significance testing.
§Fisher’s exact test conducted for significance testing.
LPE, leisure time or physical exercise.