From: Sensitivity, specificity and predictive values of linear and nonlinear indices of heart rate variability in stable angina patients
Variable
R2
SDNN (ms)
0.31
RMSSD (ms)
0.24
VLF (ms 2 )
−0.11
LF (ms 2 )
−0.39
HF (ms 2 )
−0.32
α1
<0.01
α2
0.22
-ApEn