Table 1:

Course of mean fractional anisotropy at different anatomic sites (n = 16)

Variable	T0, Mean ± SD	T1, Mean ± SD	P*†	T2, Mean ± SD	P†	P‡
CB	.173 ± .021	.161 ± .020	.000	.159 ± .016	.002	.000
FWM	.466 ± .063	.452 ± .056	.003	.442 ± .061	.000	.000
CR	.490 ± .035	.472 ± .044	.000	.463 ± .041	.000	.000
BS	.420 ± .048	.424 ± .043	.776	.434 ± .040	.121	.305

Note:—CB indicates bilateral cerebellar white matter; FWM, bilateral frontal white matter; CR, bilateral corona radiata; BS, brain stem; T0, at baseline; T1, at the end of radiotherapy; T2, at 6 weeks after radiotherapy.

^*P values are from Wilcoxon test (comparison between T0 and T1).

^†P values are from Wilcoxon test (comparison between T0 and T2).

^‡P values are from Friedman test (comparison across time).