. 2020 Jun 24;20(12):3570. doi: 10.3390/s20123570

Table 1.

Summary of the 19 ECG features (11 on morphology, 4 on F waves and 4 on heart-rate variability) characterizing each ECG recording.

Feature Type	Feature Name	Feature Unit	Feature Description
Morphology	P_pR_p	ms	time interval between P_P and R_P
	P_pQRS_off	ms	time interval between P_P and QRS_off
	QRS_onQRS_off	ms	time interval between QRS_on and QRS_off
	QRS_onT_off	ms	time interval between QRS_on and T_off
	QRS_offT_off	ms	time interval between QRS_off and T_off
	AP	µV	amplitude of the MECGB at P_P
	AQRS_on	µV	amplitude of the MECGB at QRS_on
	AQRS	µV	max-min of MECGB amplitude between QRS_on and QRS_off
	AQRS_off	µV	amplitude of the MECGB at QRS_off
	AT	µV	amplitude of the MECGB at T_P
	AQRS/AP	dimensionless	ratio between AQRS and AP
Fwaves	FWFR_FFT	%	Fast Fourier Transform spectral ratio
	FWFR_WLC	%	Welch’s method spectral ratio
	FWFR_YWK	%	Yule-Walker’s method spectral ratio
	FWFR_THM	%	Thomson’s method spectral ratio
Heart-rate variability	MRR	ms	mean RR interval
	SDRR	ms	RR-interval standard deviation
	RMSRR	ms	Root mean square of RR interval
	PRR50	%	% of RR > previous RR of more than 50 ms