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. 2021 Jul 17;2(3):446–455. doi: 10.1093/ehjdh/ztab060

Table 1.

 R2 statistic as a measure of variance explainability for single human features in the two networks (sex or age)

Feature name Highest R2 among leads Lead with the highest R2 R 2 of average feature among leads
Based on the age network
Average RR interval 0.835 0.835
Max R amplitude 0.824 avL 0.800
Max S amplitude 0.805 III 0.746
R-wave peak amplitude 0.803 I 0.789
QRS complex area 0.777 III 0.778
T-wave peak amplitude 0.774 I 0.742
T-wave area 0.766 I 0.729
T-wave full area 0.763 I 0.725
R-wave area 0.756 I 0.727
P-wave full area 0.729 avR 0.662
P-wave area 0.725 avR 0.663
QRS complex duration 0.670 0.670
P-wave peak amplitude 0.658 avR 0.496
S-wave peak amplitude 0.654 avL 0.616
QT interval 0.620 0.620
S-wave area 0.596 V5 0.634
P-wave duration 0.573 avR 0.589
R-wave duration 0.553 avL 0.469
QTc interval (corrected by Bazzet) 0.548 0.548
S-wave duration 0.545 V6 0.471
Q-wave area 0.443 avR 0.433
PR interval 0.429 0.429
Q peak amplitude 0.412 I 0.363
Q-wave duration 0.411 avR 0.409
T-wave duration 0.248 avR 0.294
Based on the sex network
Max R amplitude 0.862 V4 0.840
Max S amplitude 0.855 avR 0.759
R-wave peak amplitude 0.852 V4 0.833
R-wave area 0.840 V4 0.784
Average RR interval 0.818 0.818
T-wave peak amplitude 0.794 I 0.809
QRS complex area 0.783 V4 0.800
T-wave full area 0.780 I 0.775
T-wave area 0.779 I 0.777
QRS complex duration 0.753 0.753
P-wave full area 0.679 avR 0.646
P-wave area 0.676 avR 0.643
S-wave peak amplitude 0.651 V4 0.628
P-wave peak amplitude 0.606 I 0.509
QT interval 0.604 0.604
S-wave area 0.590 V4 0.633
QTc interval (corrected by Bazzet) 0.581 0.581
R-wave duration 0.559 V3 0.465
P-wave duration 0.523 V4 0.541
S-wave duration 0.516 V6 0.459
Q-wave area 0.414 avR 0.441
Q-wave duration 0.379 avR 0.398
PR interval 0.368 0.368
Q peak amplitude 0.364 I 0.359
T-wave duration 0.255 avR 0.313

We report only the maximal R2 values among leads and R2 values of the averaged features across leads, since the human features across leads are correlated ( R2 values across leads are reported in the Supplementary material online). Features that were derived from all 12 leads together are present as is (clearly, for these features the third column does not assign anything and the second and fourth columans assign the same value). The features are sorted according to a descending maximal  R2 value.