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Table 2 Mean values of heart rate variability by general characteristics

From: Factors related to heart rate variability among firefighters

      Unit; Mean (S.D.)
  Time domain Frequency domain
Variables SDNN RMSSD LF(ln) HF(ln) LF/HF ratio
Age (year)      
 20-29 45.63 (14.94)* 39.41 (19.80)* 6.02 (0.75)* 5.71 (0.96)* 1.94 (1.74)
 30-39 42.72 (15.41) 33.64 (16.43) 5.90 (0.95) 5.40 (1.05) 2.72 (3.59)
 40-49 34.89 (12.50) 26.03 (14.05) 5.34 (0.90) 4.80 (1.07) 2.66 (3.43)
 50-59 27.64 (11.05) 19.66 (7.73) 4.77 (0.92) 4.35 (0.95) 2.34 (2.38)
Department      
 Administrative job 36.49 (12.43) 26.54 (11.60)* 5.54 (0.88) 5.01 (0.92) 2.60 (2.92)
 Non-Administrative job 38.50 (15.18) 30.11 (16.54) 5.59 (0.99) 5.07 (1.14) 2.66 (3.49)
Shift work      
  No 35.87 (12.79) 25.78 (11.11)* 5.50 (0.93) 4.96 (0.91) 2.39 (2.30)
  Yes 38.58 (15.01) 30.17 (16.46) 5.61 (0.97) 5.08 (1.13) 2.70 (3.57)
Smoking      
  No 37.62 (14.79) 28.69 (15.31)* 5.54 (0.98)* 5.02 (1.10) 2.63 (3.18)
  Yes 39.87 (14.03) 31.96 (16.92) 5.73 (0.91) 5.21 (1.07) 2.71 (4.05)
Alcohol      
  No 35.87 (13.28)* 27.66 (13.75)* 5.39 (0.96)* 4.94 (1.04) 2.40 (3.39)
  Yes 39.31 (15.24) 30.30 (16.62) 5.68 (0.95) 5.12 (1.12) 2.78 (3.36)
Marital status      
  Unmarried 42.82 (14.88)* 34.67 (17.58)* 5.96 (0.85)* 5.43 (1.07)* 2.68 (3.72)
  Married 36.96 (14.39) 28.10 (14.96) 5.49 (0.97) 4.97 (1.08) 2.64 (3.29)
Exercise (times/week)      
   ≥ 3 38.07 (15.68) 29.52 (16.96) 5.55 (0.98) 5.02 (1.13) 2.56 (2.50)
   < 3 38.09 (13.70) 29.20 (14.50) 5.60 (0.95) 5.09 (1.06) 2.72 (3.99)
BMI      
   < 25 38.20 (14.08) 29.71 (14.91) 5.60 (0.95) 5.09 (1.07) 2.59 (3.21)
   ≥ 25 37.90 (15.49) 28.83 (16.80) 5.55 (0.98) 5.00 (1.13) 2.73 (3.61)
  1. * : p < 0.05