Table 2.

Feature ranking. Top 40 features for different L using the algorithm FS 1.

L	FS 1
30	mean, ApEn, TSMRE5, LF, LF/HF, $\max \mathbf{S}$, rmax, AR coefficient 4, TSMRE26, TSMRE8, mean(t,s), HF, LZ of AC, FuzEn, std, TP, TSMRE7, SBE2, var S, VLF, DispEn, RE(t,s), SBE6, TSMRE27, TSMRE32, SBE1, TSMRE29, TSMRE31, TSMRE1, TSMRE25, first AC min, ESVD, LZ, TSMRE30, AR coefficient 1, TSMRE6, TSMRE23, TSMRE13, TSMRE15, TSMRE14.
60	mean, ApEn, ApEnmax, first ZC, normalize HF, std, TSMRE5, TSMRE17, rmax, SBE1, SBE8, TSMRE32, TSMRE24, ESVD, SBE6, TSMRE16, std(t,s), TSMRE25, var S, FuzEn, LF/HF, mean(t,s), TSMRE18, SBE3, VLF, TP, LZ, TSMRE19, SampEn, HF, TSMRE14, TSMRE23, TSMRE21, LZ of AC, SBE7, TSMRE12, TSMRE22, TSMRE15, TSMRE13, TSMRE27.
90	mean, ApEn, ApEnmax, first ZC, std, TSMRE3, TSMRE1, SBE8, ESVD, SBE4, TSMRE27, SampEn, TSMRE4, rmax, normalize LF, LF/HF, SBE5, LF, SBE6, TSMRE2, TSMRE27, AR coefficient 3, VLF, TP, LZ of AC, TSMRE13, FuzEn, normalize HF, TSMRE14, HF, mean(t,s), TSMRE9, TSMRE12, SBE3, SBE2, TSMRE5, SBE1, SBE7, TSMRE19, TSMRE6.
120	ApEn, mean, first ZC, ApEnmax, std, TSMRE1, SBE5, TSMRE2, SampEn, ESVD, ECM, SBE4, TSMRE16, SBE1, LZ of AC, TSMRE15, first AC min, LF, TSMRE20, TSMRE21, HF, std(t,s), TSMRE22, TP, VLF, TSMRE24, TSMRE17, FuzEn, TSMRE18, TSMRE19, TSMRE27, mean(t,s), TSMRE26, TSMRE23, TSMRE32, SBE6, AR coefficient 4, TSMRE14, SBE3, $\max \mathbf{S}$.
150	TSMRE3, mean, TSMRE5, ApEnmax, ApEn, ESVD, var S, first ZC, SBE6, TSMRE1, TSMRE2, ECM, SBE2, HF, SBE8, rmax, TSMRE9, SBE4, LZ, TSMRE7, LZ of AC, TSMRE12, FuzEn, TSMRE22, TSMRE8, SampEn, TSMRE6, SBE3, normalize LF, std, TSMRE14, TSMRE17, TSMRE15, TSMRE18, VLF, TSMRE5, TSMRE10, normalize HF, $\max \mathbf{S}$, TSMRE31.
180	TSMRE3, mean, first ZC, SBE1, LF, SBE4, ApEnmax, TSMRE1, ESVD, ECM, ApEn, TSMRE13, SBE8, TSMRE15, std, SBE2, FuzEn, SBE7, SBE5, VLF, TSMRE2, LZ of AC, TP, std(t,s), TSMRE18, SBE6, SBE3, TSMRE29, HF, normalize HF, mean(t,s), $\max \mathbf{S}$, var S, AR coefficient 2, TSMRE31, TSMRE27, normalize LF, LZ, TSMRE14, TSMRE24.
210	TSMRE3, mean, LZ of AC, ApEnmax, SBE5, TSMRE1, std, AR coefficient 4, TSMRE11, ESVD, ECM, FuzEn, LF/HF, SBE4, TSMRE13, LZ, first ZC, TSMRE2, SBE3, TSMRE12, SBE7, SBE2, TSMRE15, var S, TSMRE8, SampEn, first AC min, SBE6, $\max \mathbf{S}$, SBE8, TSMRE14, TSMRE5, TSMRE10, rmax, TSMRE19, TSMRE6, TSMRE16, RE(t,s), LF, std(t,s).
240	TSMRE3, mean, first ZC, SBE8, ApEnmax, TSMRE1, ESVD, TSMRE17, LF/HF, std, TSMRE31, TSMRE2, AR coefficient 4, TSMRE28, SBE3, LZ of AC, TSMRE13, RE(t,s), SBE6, TSMRE15, SBE2, std(t,s), SampEn, SBE7, VLF, TSMRE30, ECM, normalize LF, ApEn, mean(t,s), TP, TSMRE4, SBE4, SBE5, HF, FuzEn, SBE1, TSMRE18, TSMRE16, normalize HF.
270	TSMRE3, mean, LZ of AC, std, SBE5, ApEnmax, first ZC, TSMRE1, TSMRE10, LZ, AR coefficient 2, ESVD, ECM, AR coefficient 1, SBE4, AR coefficient 4, TSMRE4, TSMRE2, SBE2, SBE8, TSMRE32, TSMRE30, SBE7, var S, LF/HF, SBE6, SBE3, TSMRE22, VLF, DispEn, TSMRE27, TSMRE25, TSMRE31, SBE1, first AC min, TP, TSMRE19, AR coefficient 3, TSMRE29, TSMRE20.
300	TSMRE3, mean, LZ of AC, ApEnmax, TSMRE1, SBE5, AR coefficient 4, std, TSMRE2, LF/HF, ESVD, ECM, TSMRE10, DispEn, normalize LF, SampEn, TSMRE16, TSMRE12, TSMRE30, HF, AR coefficient 2, TSMRE32, SBE6, TSMRE25, TSMRE15, AR coefficient 3, mean(t,s), TP, TSMRE4, TSMRE8, std(t,s), TSMRE9, AR coefficient 1, SBE3, VLF, TSMRE18, TSMRE11, var S, LF, SBE2.