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Table 2 Quantitative characterization of the 13 difference features distributions in the HFDB and the IDB

From: Serial electrocardiography to detect newly emerging or aggravating cardiac pathology: a deep-learning approach

  HFDB IDB
Total Controls Cases Total Controls Cases
(N = 129) (N = 81) (N = 48) (N = 482) (N = 398) (N = 84)
\(\Delta QRSdur\) (ms) 0.0
[− 4.0;8.0]
0.0
[− 4.0;4.5]
4.0*
[− 4.0;17.0]
0.0
[− 2.0;16.0]
0.0
[− 4.0;4.0]
8.0**
[0.0;17.0]
\(\Delta QT\) (ms) 1.0
[− 13.3;20.3]
− 1.0
[− 13.0;− 13.8]
7.5
[− 15.5;34.0]
2.0
[− 14.0;16.0]
2.5
[− 14.0;15.0]
0.0
[− 17.0;19.0]
\(\Delta |{\overline{QRSmax}}|\) (μV) − 26.0
[− 149.0;86.6]
− 34.2
[− 144.9;57.3]
− 11.9
[− 196.4;175.7]
− 21.1
[− 131.3;79.8]
− 12.1
[− 127.9;96.1]
− 38.9*
[− 144.0;16.0]
\(\Delta |{\overline{Tmax}}|\) (μV) − 15.5
[− 65.7;39.7]
− 4.6
[− 42.0;40.0]
− 48.2*
[− 133.9;33.2]
− 9.5
[− 68.1;53.5]
− 11.4
[− 68.0;45.4]
3.0
[− 70.4;87.8]
\(\Delta |{\overline{QRSintg}}|\) (mV·ms) 0.4
[− 3.9;5.3]
− 0.76
[− 3.9;3.0]
3.5*
[− 2.7;10.8]
− 0.0
[− 2.9;3.4]
− 0.3
[− 3.3;2.8]
1.7***
[− 1.5;9.1]
\(\Delta |{\overline{Tintg}}|\) (mV·ms) − 2.7
[− 13.3;7.1]
0.0
[− 10.6;7.1]
− 7.4
[− 19.2;8.1]
− 0.6
[− 10.6;8.9]
− 0.9
[− 10.7;7.5]
6.6**
[− 10.4;30.1]
\(\Delta QRScmplx\) (%) 0.3
[− 1.2;1.6]
− 0.0
[− 1.2;1.0]
1.3**
[− 0.7;3.4]
0.1
[− 0.8;1.1]
0.0
[− 1.0;0.9]
0.6***
[− 0.3;2.8]
\(\Delta Tcmplx\) (%) 0.4
[− 1.0;1.5]
0.0
[− 1.2;1.0]
1.6***
[0.2;4.1]
0.1
[− 1.2;1.4]
0.0
[− 1.1;1.1]
0.4
[− 3.6;4.4]
\(|\overline{\Delta VG}|\) (mV·ms) 27.5
[16.1;41.8]
25.0
[14.6;36.2]
32.7*
[18.1;50.0]
50.0
[37.5;65.2]
49.6
[38.0;63.0]
56.0
[33.4;86.6]
\(|\Delta SA|\) (°) 13.3
[5.3;27.0]
9.1
[3.6;14.8]
31.7***
[14.9;56.0]
9.3
[4.0;17.2]
8.3
[3.7;15.1]
15.1***
[7.1;45.5]
\(\Delta HR\) (bpm) 0.4
[− 5.2;6.1]
− 0.7
[− 5.3;4.6]
2.9*
[− 2.2;10.0]
1.4
[− 4.3;6.5]
0.5
[− 4.9;5.8]
4.9***
[− 0.2;10.1]
\(|\overline{\Delta J}|\) (μV) 24.6
[14.9;40.3]
21.5
[13.1;35.3]
32.7**
[18.8;47.4]
25.7
[17.1;43.5]
22.8
[15.1;35.2]
68.6***
[41.5;122.7]
\(\Delta Tsym\) (%) − 0.1
[− 3.1;2.5]
− 0.2
[− 2.8;1.5]
0.0
[− 5.1;4.1]
0.2
[− 2.8;2.5]
0.2
[− 2.4;2.1]
0.8
[− 4.3;5.4]
  1. Values are reported as percentiles 50th [25th;75th] percentiles
  2. *,**,***: reflects P-value \(<0.05\), \(<0.01\), \(<10^{-3}\), respectively, when comparing corresponding features computed for cases vs controls