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Table 3: Results from post hoc comparisons for fractional anisotropy (FA) between controls and patients with SCA1 and SCA2
FA Controls SCA1 SCA2 SCA1-Controls SCA2-Controls SCA1-SCA2
CST (cerebral peduncle) 0.63 ± 0.06 0.53 ± 0.09 0.48 ± 0.07 ^** ^*** ^*
CST (pons) 0.47 ± 0.05 0.39 ± 0.09 0.38 ± 0.07 ^** ^** n.s.
TPF 0.47 ± 0.06 0.42 ± 0.09 0.34 ± 0.11 ^* ^*** ^***
SCP 0.48 ± 0.04 0.42 ± 0.05 0.43 ± 0.07 ^**. ^* n.s.
MCP 0.54 ± 0.07 0.44 ± 0.08 0.40 ± 0.12 ^** ^*** n.s.
CWM 0.45 ± 0.05 0.30 ± 0.11 0.34 ± 0.10 ^*** ^*** n.s.
Note:—CST indicates corticospinal tract; TPF, transverse pontine fibers; SCP, superior cerebellar peduncles; MCP, middle cerebellar peduncles; CWM, cerebellar white matter; n.s., not significant.
Values are expressed as mean ± SD.
* P < .05,
** P < .01,
*** P < .001.

FA	Controls	SCA1	SCA2	SCA1-Controls	SCA2-Controls	SCA1-SCA2
CST (cerebral peduncle)	0.63 ± 0.06	0.53 ± 0.09	0.48 ± 0.07	^**	^***	^*
CST (pons)	0.47 ± 0.05	0.39 ± 0.09	0.38 ± 0.07	^**	^**	n.s.
TPF	0.47 ± 0.06	0.42 ± 0.09	0.34 ± 0.11	^*	^***	^***
SCP	0.48 ± 0.04	0.42 ± 0.05	0.43 ± 0.07	^**.	^*	n.s.
MCP	0.54 ± 0.07	0.44 ± 0.08	0.40 ± 0.12	^**	^***	n.s.
CWM	0.45 ± 0.05	0.30 ± 0.11	0.34 ± 0.10	^***	^***	n.s.