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Table 1: Demographic and clinical characteristics of the study groups^{^a}
MSA-p IPD Healthy Control P Value
No. 27 50 27 
Mean age (yr) 64.8 ± 8.6 (47–77) 66.5 ± 6.7 (54–81) 64.7 ± 8.5 (47–77) .521^{^b}
Male/female ratio 13:14 23:27 11:16 .850^{^c}
Mean disease duration (yr) 4.7 ± 2.9 7.8 ± 5.0 NA .010^{^d}
H&Y scale 2.85 ± 0.72 1.95 ± 0.57 NA <.001^{^d}
No. of patients with asymmetric presentation 17 10 NA <.001^{^c}
Note:—H&Y scale indicates modified Hoehn and Yahr scale; NA, not applicable.
↵a Data are presented as mean ± SD, with ranges in the parentheses.
↵b One-way analysis of variance test.
↵c χ² test.
↵d Mann-Whitney U test.

	MSA-p	IPD	Healthy Control	P Value
No.	27	50	27
Mean age (yr)	64.8 ± 8.6 (47–77)	66.5 ± 6.7 (54–81)	64.7 ± 8.5 (47–77)	.521^{^b}
Male/female ratio	13:14	23:27	11:16	.850^{^c}
Mean disease duration (yr)	4.7 ± 2.9	7.8 ± 5.0	NA	.010^{^d}
H&Y scale	2.85 ± 0.72	1.95 ± 0.57	NA	<.001^{^d}
No. of patients with asymmetric presentation	17	10	NA	<.001^{^c}