Table 5.

Results of the likelihood ratio tests of the three nested linear mixed-effect models.

Model	Difference of parameters	Chi-squarea	P value
Model Bb vs model Ac	16	31.04	.01
Model Cd vs model A	49	135.19	<.001
Model C vs model B	33	104.15	<.001

^aThe critical values of the likelihood ratio statistic are as follows: χ²_0.05(16)=26.296, χ²_0.05(33)=47.400, and χ²_0.05(49)=66.339.

^bPredictors of model B: demographics + 16 second-order statistical features.

^cPredictors of model A: demographics.

^dPredictors of model C: demographics + 16 second-order statistical features + 24 multiscale entropy features + nine frequency domain features.