Table 2.

BSPM‐Derived Computed ECG Variables

Q width	Time interval from QRS start to the first positive peak, to the moment when signal amplitude increases 30 μV above minimum value after QRS start.
R width	Time interval from QRS start to the first negative peak, to the moment when signal amplitude decreases 30 μV below maximum value after QRS start.
Ramp	Peak (negative or positive) amplitude during first 15–44.75% of the QRS.
Samp	Amplitude of the first opposite‐sign peak after the Ramp.
1st QRSint	Integral of the first quartile of QRS.
2nd QRSint	Integral of the second quartile of QRS.
3rd QRSint	Integral of the third quartile of QRS.
4th QRSint	Integral of the fourth quartile of QRS.
QRSint	Integral of entire QRS complex.
QRSSTTint	Integral from onset of QRS to end of T wave.
QRSTTarea	Integral of the absolute values from onset of QRS to end of T wave.
Jamp	Amplitude at J point.
ST60amp	Average amplitude at 58–62 ms from QRS end.
ST80amp	Average amplitude at 78–82 ms from QRS end.
ST60slope	Slope from QRS end to 60 ms from QRS end.
ST80slope	Slope from QRS end to 80 ms from QRS end.
ST60int	Integral between QRS end and 60 ms from the QRS end.
ST80int	Integral between QRS end and 80 ms from the QRS end.
STint	Integral of the first half of interval from QRS end to median T‐wave end.
STTint	Integral from QRS end to T‐wave end.
Tamp	T‐apex amplitude.
T80int	Integral from 80 ms before to 80 ms after the T‐wave apex.
TPEint	Integral from T‐wave apex to T‐wave end.