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Table 2 Relationship between various risk exposures and sleep disturbance

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*
Physical risk factors        
 Unexposed 4348 61.1 4234 97.4 114 2.6 <0.001
 Exposed 2763 38.9 2642 95.6 121 4.4  
Vibration        
 Unexposed 5324 74.9 5158 96.9 166 3.1 0.127
 Exposed 1786 25.1 1717 96.1 69 3.9  
Noise        
 Unexposed 5288 74.4 5131 97.0 157 3.0 0.005
 Exposed 1823 25.6 1744 95.7 79 4.3  
High temperature        
 Unexposed 5671 79.8 5520 97.3 151 2.7 <0.001
 Exposed 1441 20.2 1356 94.1 85 5.9  
Low temperature        
 Unexposed 6356 89.4 6164 97.0 192 3.0 <0.001
 Exposed 755 10.6 711 94.2 44 5.8  
Chemical risk factors        
 Unexposed 5484 77.1 5322 97.0 162 3.0 0.002
 Exposed 1627 22.9 1553 95.5 74 4.5  
Mist, dust, or fumes        
 Unexposed 5756 81.0 5579 96.9 177 3.1 0.025
 Exposed 1354 19.0 1296 95.7 58 4.3  
Organic solvents        
 Unexposed 6645 93.4 6437 96.9 208 3.1 0.001
 Exposed 466 6.6 438 94.0 28 6.0  
Chemical agents        
 Unexposed 6612 93.0 6406 96.9 206 3.1 0.001
 Exposed 500 7.0 470 94.0 30 6.0  
Biological risk factors        
Infectious agents        
 Unexposed 6803 95.7 6590 96.9 213 3.1 <0.001
 Exposed 308 4.3 285 92.5 23 7.5  
Psychosocial risk factors        
High job demand        
 Low 5332 75.0 5224 98.0 108 2.0 <0.001
 High 1779 25.0 1651 92.8 128 7.2  
Insufficient job control        
 Low 4118 57.9 3972 96.5 146 3.5 0.211
 High 2993 42.1 2903 97.0 90 3.0  
Inadequate social support        
 Low 3752 52.7 3650 97.3 102 2.7 0.003
 High 3360 47.3 3226 96.0 134 4.0  
Job insecurity        
 Low 2963 41.8 2871 96.9 92 3.1 0.435
 High 4127 58.2 3985 96.6 142 3.4  
Lack of reward        
 Low 4265 60.1 4158 97.5 107 2.5 <0.001
 High 2831 39.9 2702 95.4 129 4.6  
  1. *based on a chi-squared test.