Supplementary Table S3: Correlation coefficients calculated between IMFs and original data series of arrhythmic and normal subjects.

The correlation coefficient between the IMFs of and the original signal (see the description of Supplementary Table S2) was calculated to identify the IMFs with the real components of the original signal (see Supplementary Table S1). The correlation coefficients were calculated using the following equations as described by Wharton et al., 2013 and Jha et al., 2006.

为识别出包含原始信号真实分量的固有模态函数（Intrinsic Mode Function，IMF），我们计算了各IMF与原始信号之间的相关系数（详见补充表S2的说明），最终筛选得到目标IMF（详见补充表S1）。相关系数的计算遵循沃顿等人（Wharton et al., 2013）与贾等人（Jha et al., 2006）所阐述的下述公式。