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Table 2 Coefficients and statistical significance of the quadratic term in equations regressing heart rate variability indices on lag.

From: Loss of lag-response curvilinearity of indices of heart rate variability in congestive heart failure

HRV index CHF patients Normal subjects
  Coefficient P Coefficient P
Beat sequence length = 50
SDLD 0.00002 0.769 -0.00033 3.5 × 10-5
SD1 0.00002 0.741 -0.00020 3 × 10-5
SD2 -0.00004 0.417 0.00010 0.002
SD1/SD2 0.00062 0.553 -0.00510 0.0003
Beat sequence length = 50000
SDLD 1.5 × 10-6 0.968 -0.00028 1 × 10-7
SD1 2.27 × 10-6 0.932 -0.00020 1.4 × 10-7
SD2 -0.00001 0.502 0.00003 0.078
SD1/SD2 0.00028 0.531 -0.00158 4 × 10-8