Table 1 General and Occupational Characteristics of study subjects by sleep disorder
Characteristics | N | % | Sleep Disorder | p-value | |
|---|---|---|---|---|---|
Yes (%) | No (%) | ||||
Sex | |||||
 Female | 14616 | 40.7 | 217 (1.5) | 14399 (98.5) | 0.004 |
 Male | 21285 | 59.3 | 401 (1.9) | 20884 (98.1) | |
Age (year) | |||||
 15–29 | 5588 | 15.6 | 72 (1.3) | 5516 (98.7) | 0.049 |
 30–39 | 10971 | 30.6 | 202 (1.8) | 10769 (98.2) | |
 40–49 | 10488 | 29.2 | 174 (1.7) | 10314 (98.3) | |
 50–59 | 6058 | 16.9 | 119 (2.0) | 5939 (98.0) | |
 60– | 2796 | 7.8 | 51 (1.8) | 2745 (98.2) | |
Occupation | |||||
 White collar | 17343 | 48.3 | 332 (1.9) | 17011 (98.1) | 0.021 |
 Service worker | 6279 | 17.5 | 92 (1.5) | 6187 (98.5) | |
 Blue collar | 12280 | 34.2 | 194 (1.6) | 12086 (98.4) | |
Income (won) | |||||
  − 990,000 | 4149 | 11.6 | 64 (1.5) | 4085 (98.5) | <0.001 |
 1,000,000–1,990,000 | 13534 | 37.7 | 198 (1.5) | 13336 (98.5) | |
 2,000,000–2,990,000 | 10086 | 28.1 | 174 (1.7) | 9912 (98.3) | |
 3,000,000– | 8133 | 22.7 | 182 (2.2) | 7951 (97.8) | |
Education | |||||
 Middle school or below | 3893 | 10.8 | 74 (1.9) | 3819 (98.1) | 0.743 |
 High school | 13155 | 36.6 | 207 (1.6) | 12948 (98.4) | |
 College or above | 18853 | 52.5 | 337 (1.8) | 18516 (98.2) | |
Work type | |||||
 Regular | 28542 | 79.5 | 504 (1.8) | 28038 (98.2) | 0.232 |
 Temporary or part-time | 7360 | 20.5 | 115 (1.6) | 7245 (98.4) | |
Alcohol | |||||
 No | 8215 | 22.9 | 164 (2.0) | 8051 (98.0) | 0.373 |
  ≤ Once per week | 18230 | 50.8 | 284 (1.6) | 17946 (98.4) | |
  ≥ Twice per week | 9457 | 26.3 | 170 (1.8) | 9287 (98.2) | |
Smoking | |||||
 Non-smoker | 19613 | 54.8 | 308 (1.6) | 19305 (98.4) | 0.295 |
 Ex-smoker | 4037 | 11.2 | 105 (2.6) | 3932 (97.4) | |
 Current-smoker | 12252 | 34.1 | 205 (1.7) | 12047 (98.3) | |
Working hours per week (hours) | |||||
  ≤ 45 h | 16173 | 45 | 216 (1.3) | 15957 (98.7) | <0.001 |
  > 45 h | 19729 | 55 | 403 (2.0) | 19326 (98.0) | |
Tenure (years) | |||||
  ≥ 1 year | 30672 | 85.4 | 527 (1.7) | 30145 (98.3) | 0.911 |
  < 1 year | 5230 | 14.6 | 91 (1.7) | 5139 (98.3) | |
Shift work | |||||
 No | 32534 | 90.6 | 477 (1.5) | 32057 (98.5) | <0.001 |
 Yes | 3368 | 9.4 | 142 (4.2) | 3226 (95.8) | |
Workplace scale (person) | |||||
  ~ 99 | 29253 | 81.5 | 434 (1.5) | 28819 (98.5) | <0.001 |
 100 ~ 999 | 4131 | 11.5 | 117 (2.8) | 4014 (97.2) | |
 999~ | 1354 | 3.8 | 52 (3.8) | 1302 (96.2) | |
 Unknown | 1163 | 3.2 | 15 (1.3) | 1148 (98.7) | |
Total | 35902 | 100.0 | 618 (1.7) | 35284 (98.3) | |