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Table 2: Correlation of disease severity and CNS volumes with disease duration and CAG repeat length
Disease Duration CAG Repeat Length
SCA3 SCA6 SCA3 SCA6
ICARS score ρ = 0.598 ρ = 0.632 N.S. N.S.
P = .011^a P = .006^b 
Cerebellar volume ρ = −0.506 ρ = −0.623 N.S. N.S.
P = .038^a P = .017^a 
Brain stem ρ = −0.51 N.S. N.S. N.S.
volume P = .036^a 
a Significant with P < .05.
b Highly significant with P < .01.

	Disease Duration		CAG Repeat Length
	SCA3	SCA6	SCA3	SCA6
ICARS score	ρ = 0.598	ρ = 0.632	N.S.	N.S.
	P = .011^a	P = .006^b
Cerebellar volume	ρ = −0.506	ρ = −0.623	N.S.	N.S.
	P = .038^a	P = .017^a
Brain stem	ρ = −0.51	N.S.	N.S.	N.S.
volume	P = .036^a