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Table 1 General and Occupational Characteristics of study subjects by sleep disorder

From: The association of relational and organizational job stress factors with sleep disorder: analysis of the 3rd Korean working conditions survey (2011)

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)
  1. P-value of chi-squared Pearson’s test