Table 4.

Mean EEG power and coherence for four subgroups of the IG and FCG based on a cutoff of 18.5 months at placement or study entry. The means for the early-placed FCG and early-entry IG are from the 30-month time point. The means for the late-placed FCG and late-entry IG are from the 42-month time point.

	Early- placed FCG (n=13)	Early FCG vs. early IG	Early- entry IG (n=15)	Early vs. late FCG	Late- placed FCG (n=40)	Late FCG vs late IG	Late- entry IG (n=29)
Power
Alpha AP	3.76 (.38)	n.s	3.60 (.34)	n.s	3.59 (.32)	n.s	3.51 (.31)
Alpha RP	.335 (.058)	n.s	.328 (.052)	n.s	.338 (.054)	n.s	.331 (.055)
Beta RP	.165 (.044)	n.s	.166 (.092)	n.s	.181 (.049)	n.s	.194 (.051)
Coherence
Alpha F-C	.438 (.097)	n.s	.472 (.120)	p=.06	.485 (.069)	n.s	.486 (.075)
Alpha F-T	.325 (.074)	**	.395 (.053)	*	.364 (.053)	n.s	.379 (.062)
Beta F-C	.532 (.131)	n.s	.564 (.127)	n.s	.536 (.082)	n.s	.573 (.088)

Significance values from T-tests are shown for three sets of comparisons: Early-placed FCG with early-entry IG, early-placed FCG with late-placed FCG, and late-placed FCG with late-entry IG

^*p<.05;

^**p<.01;

n.s p>.05