Table 1.

List of the 13 difference features

#Feature	Abbreviation	Units	Description
1	$\mathrm{\Delta }QRSdur$	ms	QRS-duration difference
2	$\mathrm{\Delta }QT$	ms	QT-interval difference
3	$\mathrm{\Delta }|\overline{\mathit{QRSmax}}|$	μV	Difference in maximal QRS-vector magnitude
4	$\mathrm{\Delta }|\overline{\mathit{Tmax}}|$	μV	Difference in maximal T-vector magnitude
5	$\mathrm{\Delta }|\overline{\mathit{QRSintg}}|$	mV·ms	QRS-integral vector magnitude difference
6	$\mathrm{\Delta }|\overline{\mathit{Tintg}}|$	mV·ms	T-integral vector magnitude difference
7	$\mathrm{\Delta }QRScmplx$	%	QRS-complexity difference
8	$\mathrm{\Delta }Tcmplx$	%	T-wave complexity difference
9	$|\overline{\mathrm{\Delta }VG}|$	mV·ms	Magnitude of the ventricular-gradient difference vector
10	$|\mathrm{\Delta }SA|$	°	Magnitude of the QRS-T spatial-angle difference
11	$\mathrm{\Delta }HR$	bpm	Heart-rate difference
12	$|\overline{\mathrm{\Delta }J}|$	μV	Magnitude of J-vector difference vector
13	$\mathrm{\Delta }Tsym$	%	T-wave symmetry difference

These 13 features are obtained from the subtraction of the 13 VCG features computed using the BLECG from the corresponding 13 VCG features computed using the FUECG