TABLE 2.

A: PATIENT DEMOGRAPHICS, BY STUDY GROUP
	Definite MSA-C [n = 12]	ILOCA [n=12]	Definite MSA-C vs. ILOCA p	Possible / Probable MSA-C [n = 53]	Possible / Probable MSA-C vs. ILOCA p
Age at symptom onset yrs	54.7 ± 8.5	41.1 ± 14.2	0.01	56.8 ± 8.7	< 0.001
Disease duration, initial visit, yrs	3.4 ± 1.5	5.5 ± 3.7	0.08	4.2 ± 2.7	0.14
Male sex, n (%)	6 (50)	8 (67)	0.68	32 (60)	0.75
Clinical follow-up time yrs	4.5 ± 3.1	7.4 ± 7.0	0.19	2.1 ± 2.2	< 0.001

B: PATIENT DEMOGRAPHICS, Possible MSA-C vs Probable MSA-C
	Possible MSA-C [n = 10]	Probable MSA-C [n=43]	Possible vs. Probable MSA-C p
Age at symptom onset, yrs	54.0 ± 12.2	56.9 ± 7.7	0.49
Disease duration, initial visit, yrs	3.7 ± 2.3	4.3 ± 2.8	0.52
Male sex, n (%)	7(25)	25(58)	0.72
Clinical follow-up time yrs	1.1 ± 1.3	2.3 ± 2.3	0.045

Baseline characteristics of patients with Definite and Possible/Probable Multiple System Atrophy-Cerebellar type (MSA-C) and Idiopathic Late Onset Cerebellar Ataxia (ILOCA) are compared. Data are presented as mean ± standard deviation and n (%). yrs = years.

The same characteristics are compared between the Possible and Probable MSA-C patients whose diagnosis was not confirmed pathologically.