Table 2.

Comparison of the area under the ROC obtained for every spectral metric for each length. P-values obtained from a paired t-test are given. The significant P values are shown in bold face. The t-values calculated for every pair are shown also in this table.

	two-minute vs five-minute		two-minute vs ten-minute		five-minute vs ten-minute
	t-score	P-value	t-score	P-value	t-score	P-value
nVLF	3.034	0.005	4.942	0.000	4.140	0.000
nLF	0.891	0.381	−1.376	0.180	−2.675	0.013
nHF	−3.526	0.002	−5.130	0.000	−2.304	0.029
VLF	2.480	0.020	2.758	0.010	1.478	0.151
LF	2.185	0.038	2.034	0.052	0.719	0.478
HF	3.147	0.004	2.167	0.039	1.184	0.247