TABLE 5.

Combinations of three predictors with the top five predictive performance.

Best combination	Concordant,%	Discordant,%	Somers’ D	c-Statistic
LVEF ≤35%
α1 + Acv + rMSSD	82.1	17.9	0.641	0.821
Acv + rMSSD + HF	81.8	18.2	0.636	0.818
Acv + rMSSD + pNN50	81.5	18.5	0.629	0.815
SDNN + Acv + rMSSD	81.5	18.5	0.63	0.815
ULF + Acv + rMSSD	81.5	18.5	0.63	0.815
LVEF >35%
ULF + Acv + λ25s	84.4	15.6	0.689	0.844
VLF + Acv + λ25s	83.7	16.3	0.674	0.837
ULF + VLF + λ25s	83.2	16.8	0.665	0.832
SDNN + VLF + λ25s	83.1	16.9	0.661	0.831
VLF + λ25s + pNN50	83.1	16.9	0.663	0.831

All prediction models are adjusted for the effect of age. Abbreviations are explained in the footnote in Table 2.