Table 2.

Spearman correlations between the grand average spectral slope and power of periodic oscillations

	TD	ASD	TD + ASD
Eyes-open condition
Alpha	R(49) = − 0.26#	R(49) = − 0.11	R(98) = − 0.19#
Beta	R(49) = − 0.36*	R(49) = − 0.36*	R(98) = − 0.36**
Eyes-closed condition
Alpha	R(45) = − 0.57**	R(38) = − 0.25	R(83) = − 0.41**
Beta	R(45) = − 0.53**	R(38) = − 0.28#	R(83) = − 0.40**

Alpha, power of periodic oscillations in the alpha (7–13 Hz) band; Beta, power of periodic oscillations in the beta (14–25 Hz) band; TD, typically developing children; ASD, children with autism spectrum disorder; and TD + ASD, combined sample of the children

^#p < 0.1; *p < 0.05; **p < 0.001