说明： The Bland–Altman analysis for repeated measures on 10-minute
time windows in the awake state (around 7 PM) and during sleep
(around 12 AM) was used to compare OHR and HRECG . The
Mann–Whitney U-test was used to compare the average HRECG and
OHR of all patients in a 10-minute window in both activity states. All
signal preprocessing and statistical analyses were performed with
MATLAB 2011a . The studywas approved by the local research ethics
committee of the Academic Centre for Epileptology Kempenhaeghe.