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Table 4 Correlation between Korean Occupational Stress Scale (KOSS) score and sleep quality

From: Factors Related to Sleep Disorders among Male Firefighters

  Sleep quality  
Categories in the KOSS Good Poor p-value*
n (%) n (%)  
Job demand    
  Low 280 (54.9) 230 (45.1) 0.001
  High 57 (38.8) 90 (61.2)  
Insufficient job control    
  Low 240 (56.2) 187 (43.8) 0.001
  High 97 (42.2) 133 (57.8)  
Interpersonal conflict    
  Low 274 (52.4) 249 (47.6) 0.267
  High 63 (47.0) 71 (53.0)  
Job insecurity    
  Low 327 (52.2) 299 (47.8) 0.030
  High 10 (32.3) 21 (67.7)  
Organizational system    
  Low 288 (55.3) 233 (44.7) <0.001
  High 49 (36.0) 87 (66.2)  
Lack of reward    
  Low 224 (59.3) 154 (40.7) <0.001
  High 113 (40.5) 166 (59.5)  
Occupational climates    
  Low 231(60.8) 149(39.2) <0.001
  High 106 (38.3) 171(61.7)  
Total    
  Low 307 (54.6) 255 (45.4) <0.001
  High 30 (31.6) 65 (68.4)  
  1. *Calculated using theχ2-test.