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).