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Table 5 Analysis of covariance in KOSS and HRV (Frequency domain)a

From: Factors related to heart rate variability among firefighters

    Unit; Mean (S.D.)
Variables LF(ln) HF(ln) LF/HF ratio
Physical environment    
  Low 5.55 (0.90) 5.05 (1.02) 2.53 (3.10)
  High 5.60 (1.01) 5.06 (1.16) 2.74 (3.59)
Job demand    
  Low 5.59 (0.99) 5.13 (1.11) 2.39 (2.83)
  High 5.58 (0.95) 5.00 (1.08) 2.85 (3.75)
Insufficient job control    
  Low 5.59 (0.97) 5.09 (1.12) 2.49 (2.59)
  High 5.57 (0.96) 5.03 (1.08) 2.77 (3.87)
Interpersonal conflict    
  Low 5.62 (0.95) 4.97 (1.10) 3.04 (3.21)
  High 5.58 (0.97) 5.06 (1.10) 2.62 (3.38)
Job insecurity    
  Low 5.68 (0.94) 5.10 (1.09) 2.85 (3.57)
  High 5.49 (0.98) 5.02 (1.10) 2.46 (3.18)
Organizational system    
  Low 5.61 (0.90) 5.17 (1.04)* 2.43 (3.00)
  High 5.56 (1.01) 4.98 (1.13) 2.79 (3.60)
Lack of reward    
  Low 5.60 (0.94) 5.19 (1.08) 2.21 (2.15)
  High 5.57 (0.98) 5.00 (1.10) 2.85 (3.80)
Occupational climate    
  Low 5.69 (0.93) 5.18 (1.07)* 2.55 (3.13)
  High 5.49 (0.98) 4.96 (1.11) 2.72 (3.57)
Total    
  Low 5.60 (0.96) 5.12 (1.10) 2.54 (3.14)
  High 5.56 (0.97) 5.00 (1.09) 2.75 (3.59)
  1. aModel was adjusted for age, smoking, alcohol intake, shift work, marital status and department
  2. * : p < 0.05