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Table 4 Analysis of covariance in KOSS and HRV (Time domain)a

From: Factors related to heart rate variability among firefighters

   Unit; Mean (S.D.)
Variables SDNN RMSSD
Physical environment   
  Low 37.47 (13.42) 28.91 (15.18)
  High 38.62 (15.65) 29.75 (16.13)
Job demand   
  Low 38.61 (14.73) 30.96 (16.41)
  High 37.64 (14.59) 28.04 (14.97)
Insufficient job control   
  Low 38.40 (15.82) 29.79 (17.59)
  High 37.84 (13.70) 29.02 (14.08)
Interpersonal conflict   
  Low 37.92 (14.27) 27.86 (13.66)
  High 38.09 (14.69) 29.46 (15.83)
Job insecurity   
  Low 38.85 (14.78) 30.21 (16.81)
  High 37.39 (14.53) 28.59 (14.60)
Organizational system   
  Low 38.84 (14.81) 30.52 (16.92)
  High 37.56 (14.54) 28.56 (14.76)
Lack of reward   
  Low 39.40 (15.75) 31.26 (17.61)
  High 37.45 (14.08) 28.45 (14.62)
Occupational climate   
  Low 39.54 (15.25)* 31.28 (17.50)*
  High 36.87 (14.05) 27.76 (13.84)
Total   
  Low 38.51 (15.06) 30.41 (17.28)
  High 37.65 (14.24) 28.30 (13.89)
  1. aModel was adjusted for age, smoking, alcohol intake, shift work, marital status and department
  2. * : p < 0.05