Table 1. General and occupational characteristics of the participants according to insomnia and normal sleep.
| Variables | Total | Normal sleep | Insomnia | p | |
|---|---|---|---|---|---|
| Total | 27,235 (100) | 25,181 (100) | 2,054 (100) | ||
| Sex | < 0.0001 | ||||
| Male | 13,398 (49.2) | 12,486 (49.6) | 912 (44.4) | ||
| Female | 13,837 (50.8) | 12,695 (50.4) | 1,142 (55.6) | ||
| Age (years) | < 0.0001 | ||||
| 20–29 | 3,570 (13.1) | 3,295 (13.1) | 275 (13.4) | ||
| 30–39 | 6,510 (23.9) | 6,094 (24.2) | 416 (20.3) | ||
| 40–49 | 7,192 (26.4) | 6,676 (26.5) | 516 (25.0) | ||
| 50–59 | 6,190 (22.7) | 5,681 (22.6) | 509 (24.8) | ||
| ≥ 60 | 3,773 (13.9) | 3,435 (13.6) | 338 (16.5) | ||
| Health condition | < 0.0001 | ||||
| Not good | 7,557 (27.8) | 6,801 (27.0) | 756 (36.8) | ||
| Good | 19,678 (72.2) | 18,380 (73.0) | 1,298 (63.2) | ||
| Education | < 0.0001 | ||||
| Elementary school or below | 1,302 (4.8) | 1,172 (4.7) | 130 (6.3) | ||
| Middle school | 1,817 (6.7) | 1,665 (6.6) | 152 (7.4) | ||
| High school | 9,266 (34.0) | 8,476 (33.7) | 790 (38.5) | ||
| College or above | 14,850 (54.5) | 13,868 (55.0) | 982 (47.8) | ||
| Income (× 10,000 KRW/month) | < 0.0001 | ||||
| < 100 | 2,011 (7.3) | 1,860 (7.4) | 151 (7.4) | ||
| 100–199 | 7,532 (27.7) | 6,916 (27.5) | 616 (30.0) | ||
| 200–299 | 12,684 (46.6) | 11,839 (47.0) | 845 (41.1) | ||
| ≥ 300 | 5,008 (18.4) | 4,566 (18.1) | 442 (21.5) | ||
| Type of occupation | < 0.0001 | ||||
| Management/professional | 4,395 (16.1) | 4,112 (16.3) | 283 (13.8) | ||
| White collar | 6,659 (24.4) | 6,248 (24.8) | 411 (20.0) | ||
| Service/sale | 7,776 (28.6) | 7,088 (28.2) | 688 (33.5) | ||
| Blue collar | 4,357 (16.0) | 4,046 (16.1) | 311 (15.1) | ||
| Simple labor | 4,048 (14.9) | 3,687 (14.6) | 361 (17.6) | ||
| Shift work | < 0.0001 | ||||
| No | 23,857 (87.6) | 22,132 (87.9) | 1,725 (84.0) | ||
| Yes | 3,378 (12.4) | 3,049 (12.1) | 329 (16.0) | ||
| Night work | 0.0154 | ||||
| No | 24,686 (90.6) | 22,855 (90.8) | 1,831 (89.1) | ||
| Yes | 2,549 (9.4) | 2,326 (9.2) | 223 (10.9) | ||
| Working condition satisfaction | < 0.0001 | ||||
| Not satisfied | 6,182 (22.7) | 5,380 (21.4) | 802 (39.0) | ||
| Satisfied | 21,053 (77.3) | 19,801 (78.6) | 1,252 (61.0) | ||
| Job stress | < 0.0001 | ||||
| No | 5,075 (18.6) | 4,832 (19.2) | 243 (11.8) | ||
| Yes | 22,160 (81.4) | 20,349 (80.8) | 1,811 (88.2) | ||
| Colleague support | 0.1232 | ||||
| No | 1,457 (5.3) | 1,332 (5.3) | 125 (6.1) | ||
| Yes | 25,778 (94.7) | 23,849 (94.7) | 1,929 (93.9) | ||
| Working hour (hours per week) | 0.0195 | ||||
| ≤ 52 | 23,471 (86.2) | 21,736 (86.3) | 1,735 (84.5) | ||
| > 52 | 3,764 (13.8) | 3,445 (13.7) | 319 (15.5) | ||
Values are presented as number (%).