Table 1. The demographic, clinical, and MR image data of control and patient groups.

Characteristic	Group
	Controls (N = 50)	SCA3 Patients (N = 48)	p value
Sex(F/M)	25/25	21/27	0.535 a
Age(years) †	48.24 ± 13.956	48.13 ± 11.747	0.516 b
Duration(years) †	—	8.89 ± 6.432	—
SARA †	—	14 ± 8.103	—
H & Y staging †	—	2.88 ± 1.19	—
MMSE †	—	28.5 ± 1.61	—
EEG signals observation(abnormal/normal)	—	5/12	—
Cerebral atrophy observed via visual inspection	—	9	—
Cerebellar atrophy observed via visual inspection	—	39	—

SARA = Scale for the Assessment and Rating of Ataxia; MMSE = Mini-Mental State Examination; H & Y staging = Hoehn and Yahr Staging Scale

^a Pearson's chi square test(χ ² = 0.384);

^b two-tailed two-sample t-test;

^† Continuous variables are expressed as mean ± standard deviation (SD);