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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