Combining multiple ECG features does not improve prediction of defibrillation outcome compared to single features in a large population of out-of-hospital cardiac arrests

Table 2 Correlation coefficients among the 16 candidate features used for defibrillation outcome prediction

	MS	AMSA	SignInt	PSA	PPA	Mds	MP	PF	CF	EG	SFM	WE	AR	SPE	RMS
AMSA	0.86**
SignInt	0.81**	0.91**
PSA	0.93**	0.84**	0.90**
PPA	0.85**	0.94**	0.98**	0.91**
Mds	0.85**	0.91**	0.93**	0.86**	0.92**
MP	0.31**	0.14**	0.18**	0.36**	0.26**	0.16**
PF	0.20**	0.28**	0.34**	0.24**	0.34**	0.32**	0
CF	0.08**	0.17**	0.15**	0.09**	0.17**	0.10**	-0.08**	0.77**
EG	0.14**	-0.02	-0.01	0.17**	0.07**	-0.01	0.98**	-0.05**	-0.10**
SFM	-0.04	0	-0.12**	-0.07**	-0.06**	-0.16**	0.03	0.43**	0.83**	0.07**
WE	0.86**	0.82**	0.92**	0.95**	0.90**	0.84**	0.21**	0.28**	0.14**	0.01	-0.06**
AR	0.81**	0.93**	0.91**	0.85**	0.94**	0.82**	0.21**	0.30**	0.19**	0.04*	0.02	0.86**
SPE	0.07**	0.13**	0.12**	0.07**	0.12**	0.12**	0.02	0.06**	0	0	-0.07**	0.07**	0.12**
RMS	0.83**	0.88**	0.95**	0.91**	0.97**	0.88**	0.46**	0.31**	0.12**	0.29**	-0.07**	0.88**	0.92**	0.11**
Hu	0	0.05*	-0.04	-0.01	0	-0.11**	0.04	-0.10**	-0.02	0.04*	0.10**	0	0.15**	0	0.02

MS mean slope, AMSA amplitude spectral area, SignInt signal integral, PSA power spectrum analysis, PPA average peak-to-peak amplitude, Mds median slope, MP max power, PF peak frequency, CF centroid frequency, EG energy, SFM spectral flatness measure, WE wavelet energy, AR amplitude range, SPE spectrum entropy, RMS root mean square, Hu Hurst index
*p < 0.05, **p < 0.01

ISSN: 1364-8535