Table 2.
Sleep behaviours according to depressive symptoms and suicidal ideation.
| Total | Nondepressed (n = 1485) |
Depressed (n = 507) |
p value | No suicidal ideation (n = 1877) | Suicidal ideation (n = 115) |
p value | |
|---|---|---|---|---|---|---|---|
| n (%) | n (%) | n (%) | n (%) | n (%) | |||
| Bedtime | |||||||
| 23:30 or earlier | 287 (14.4) | 223 (15.0) | 64 (12.6) | 0.01 | 274 (14.6) | 13 (11.3) | 0.04 |
| 23:30–00:30 | 860 (43.2) | 659 (44.3) | 201 (39.6) | 821 (43.7) | 39 (33.9) | ||
| 00:30–01:30 | 663 (33.3) | 482 (32.5) | 181 (35.7) | 616 (32.8) | 47 (40.9) | ||
| Later than 01:30 | 182 (9.1) | 121 (8.1) | 61 (12.0) | 166 (8.8) | 16 (13.9) | ||
| Wake time | |||||||
| 06:00 or earlier | 935 (46.9) | 718 (48.4) | 217 (42.8) | 0.15 | 882 (47.0) | 53 (46.1) | 0.65 |
| 06:00–07:00 | 762 (38.3) | 555 (37.4) | 207 (40.8) | 717 (38.2) | 45 (39.1) | ||
| 07:00–08:00 | 242 (12.2) | 176 (11.9) | 66 (13.0) | 230 (12.3) | 12 (10.4) | ||
| Later than 08:00 | 53 (2.7) | 36 (2.4) | 17 (3.4) | 48 (2.6) | 5 (4.3) | ||
| Sleep-onset latency | 0.17 | ||||||
| <30 min | 1526 (76.6) | 1170 (78.8) | 356 (70.2) | <0.01 | 1444 (76.9) | 82 (71.3) | |
| ≥30 min | 466 (23.4) | 315 (21.2) | 151 (29.8) | 433 (23.1) | 33 (28.7) | ||
| Sleep duration | |||||||
| 6 h or less | 551 (27.7) | 421 (28.4) | 130 (25.6) | 0.34 | 510 (27.2) | 41 (35.7) | 0.23 |
| 6-7 h | 932 (46.8) | 699 (47.1) | 233 (46.0) | 886 (47.2) | 46 (40.0) | ||
| 7-8 h | 417 (20.9) | 298 (20.1) | 119 (23.5) | 395 (21.0) | 22 (19.1) | ||
| >8 h | 92 (4.6) | 67 (4.5) | 25 (4.9) | 86 (4.6) | 6 (5.2) | ||
| Sleep quality | <0.01 | <0.0001 | |||||
| Good sleep | 1329 (66.7) | 1070 (72.1) | 259 (51.1) | 1278 (68.1) | 51 (44.3) | ||
| Poor sleep | 663 (33.3) | 415 (28.0) | 248 (48.9) | 599 (32.0) | 64 (55.7) |