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Table 1 Number of workers with sleep disturbance by general and occupational characteristics

From: Association between Workplace Risk Factor Exposure and Sleep Disturbance: Analysis of the 2nd Korean Working Conditions Survey

    Sleep disturbance  
  N % No (%) Yes (%) p-value*
Total 7112 100.0 6876 96.7 236 3.3  
Gender        
 Female 2928 41.2 2833 96.8 95 3.2 0.771
 Male 4184 58.8 4043 96.6 141 3.4  
Age        
 <30 1481 20.8 1442 97.4 39 2.6 0.524
 30-39 2057 28.9 1985 96.5 72 3.5  
 40-49 1880 26.4 1812 96.4 68 3.6  
 50-59 1155 16.2 1118 96.8 37 3.2  
 ≥60 539 7.6 519 96.3 20 3.7  
Educational status        
 Middle school or below 973 13.7 936 96.2 37 3.8 0.047
 High school 2966 41.7 2886 97.3 80 2.7  
 College or above 3172 44.6 3053 96.2 119 3.8  
Smoking        
 Non-smoker 3884 54.6 3751 96.6 133 3.4 0.847
 Ex-smoker 697 9.8 674 96.7 23 3.3  
 Smoker 2531 35.6 2451 96.8 80 3.2  
Drinking frequency        
 None 1938 27.3 1891 97.6 47 2.4 0.026
 ≤1 per week 2965 41.7 2862 96.5 103 3.5  
 ≥2 per week 2208 31.1 2122 96.1 86 3.9  
Employment status        
 Regular 4568 64.2 4430 97.0 135 3.0 0.061
 Temporary 2544 35.8 2446 96.1 98 3.9  
 Job type        
 White collar 3081 43.3 2966 96.3 115 3.7 0.006
 Service 1350 19.0 1324 98.1 26 1.9  
 Blue collar 2680 37.7 2586 96.5 94 3.5  
Number of employees        
 <5 1526 22.3 1474 96.6 52 3.4 <0.001
 5-49 3295 48.4 3210 97.4 85 2.6  
 50-299 1315 19.3 1246 94.8 69 5.2  
 ≥300 689 10.0 667 96.8 22 3.2  
Tenure (yr)        
 <1 1477 20.8 1431 96.9 46 3.1 0.764
 1-9 4084 57.4 3943 96.5 141 3.5  
 ≥10 1550 21.8 1501 96.8 49 3.2  
Working time (hr/wk)        
 <40 1105 15.5 1083 98.0 22 2.0 <0.001
 40-48 3801 53.5 3697 97.3 104 2.7  
 49-60 1624 22.8 1562 96.2 62 3.8  
 ≥61 581 8.2 533 91.7 48 8.3  
Shift work        
 No 6337 89.1 6153 97.1 184 2.9 <0.001
 Yes 774 10.9 722 93.3 52 6.7  
Hypertension        
 No 6622 93.1 6412 96.8 210 3.2 0.011
 Yes 490 6.9 464 94.7 26 5.3  
Obesity        
 No 6885 96.8 6667 96.8 218 3.2 <0.001
 Yes 226 3.2 209 92.5 17 7.5  
Depressive symptoms        
 No 6999 98.4 6811 97.3 188 2.7 <0.001
 Yes 113 1.6 65 57.5 48 42.5  
  1. *based on a chi-squared test.