Table 2.

Comparison by paired groups of patients for Shannon’s spectral entropy (SSE) and ρ using ${\chi }^2$. Statistical significance for either 5 (SSE) or 7 (ρ) degrees of freedom (ν) is indicated by p in column to the right of every variable.

Paired Groups	SSE $\left({\mathit{\chi }}^2\right)$	p (ν = 5)	$\mathit{\rho } ({\mathit{\chi }}^2)$	p (ν = 7)
ENC/COVID	35.4	0.001	10.7	n.s
ENC/CRA	3.3	n.s	1.8	n.s
COVID/CRA	15.6	0.01	5.5	n.s

n.s., not significant.