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Table 5 Correlation (R 2 ) between linear and nonlinear variables with age

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 <0.01