Table 1.
Participant characteristics and prevalence of insomnia and excessive daytime sleepiness
| Characteristics | Insomnia | Excessive daytime sleepiness | Total participants |
|---|---|---|---|
| Total | 1,316 (32.9) | 510 (12.8) | 4000 (100) |
| Sex*,† | |||
| Male | 583 (28.6) | 300 (14.7) | 2035 (50.9) |
| Female | 733 (37.3) | 210 (10.7) | 1965 (49.1) |
| Age*,† (years) | |||
| 20–29 | 272 (37.9) | 114 (15.9) | 717 (17.9) |
| 30–39 | 263 (36.7) | 127 (17.7) | 717 (17.9) |
| 40–49 | 256 (29.3) | 107 (12.2) | 874 (21.8) |
| 50–59 | 295 (31.9) | 86 (9.3) | 924 (23.1) |
| 60–69 | 230 (29.9) | 76 (9.9) | 768 (19.2) |
| Place of residence | |||
| Seoul | 286 (37.3) | 117 (15.3) | 766 (19.2) |
| Gyeonggi/Gangwon | 479 (33.9) | 174 (12.2) | 1423 (35.3) |
| Daejeon/Chungcheong | 132 (31.5) | 55 (13.1) | 419 (10.5) |
| Daegu/Gyeongbuk | 116 (30.5) | 35 (9.2) | 380 (9.5) |
| Busan/Gyeongnam | 181 (30.3) | 73 (12.2) | 598 (15) |
| Gwangju/Jeonla/Jeju | 122 (28.8) | 56 (13.2) | 424 (10.6) |
| Marital status*,† | |||
| Married | 690 (29.5) | 262 (11.2) | 2338 (58.5) |
| Unmarried | 548 (38.1) | 230 (16.0) | 1437 (35.9) |
| Divorced/Widowed | 78 (34.7) | 18 (8.0) | 225 (5.6) |
| Employment status† | |||
| Employed | 921 (32.3) | 388 (13.6) | 2852 (71.3) |
| Unemployed | 395 (34.4) | 122 (10.6) | 1148 (28.7) |
| Working pattern* | |||
| Day work | 812 (31.5) | 356 (13.8) | 2581 (90.5) |
| Shift work | 83 (40.5) | 26 (12.7) | 205 (7.2) |
| Night work | 26 (39.4) | 6 (9.1) | 66 (2.3) |
| Monthly income (USD)*,† | |||
| < 1600 | 198 (38.3) | 65 (12.6) | 517 (12.9) |
| 1600–2399 | 250 (37.4) | 105 (15.7) | 669 (16.7) |
| 2400–3199 | 218 (31.9) | 93 (13.6) | 683 (17.1) |
| 3200–3999 | 184 (29.6) | 75 (12.0) | 622 (15.6) |
| 4000–4799 | 147 (30.8) | 61 (12.8) | 477 (11.9) |
| 4800–5599 | 112 (31.5) | 21 (5.9) | 355 (8.9) |
| > 5600 | 207 (30.6) | 90 (13.3) | 677 (16.9) |
| Alcohol consumption† | 903 (33.5) | 367 (13.6) | 2694 (67.4) |
| Smoking | 298 (36.3) | 131 (16.0) | 821 (20.5) |
| Weekday | |||
| Sleep latency (minutes)*,† | 44.7 ± 32.6 | 33.7 ± 30.4 | 30.6 ± 26.6 |
| Total sleep time (minutes)*,† | 384 ± 89 | 388 ± 86 | 397 ± 78 |
| Weekend | |||
| Sleep latency (minutes)*,† | 49.0 ± 34.2 | 37.1 ± 31.7 | 34.2 ± 29.1 |
| Total sleep time (minutes)* | 448 ± 102 | 460 ± 105 | 457 ± 90 |
Data are presented as number (%)
USD United States dollar
*p < 0.05 for insomina, †p < 0.05 for excessive daytime sleepiness