Table 3:

Mean diffusivity histogram parameters^*

	Percentile			Mean	SD	Skewness	Kurtosis
	25th	50th	75th
Controls	0.732 ± 0.032	0.825 ± 0.043	0.968 ± 0.058	0.884 ± 0.048	0.311 ± 0.021	1.75 ± 0.15	9.88 ± 1.22
PD Patients	0.734 ± 0.030	0.824 ± 0.053	0.971 ± 0.062	0.888 ± 0.045	0.315 ± 0.024	1.70 ± 0.21	9.42 ± 1.32
ART-PD	0.737 ± 0.029	0.829 ± 0.072	0.986 ± 0.076	0.900 ± 0.050	0.326 ± 0.024	1.66 ± 0.30	9.01 ± 1.74
TDT-PD	0.722 ± 0.027	0.809 ± 0.028	0.943 ± 0.037	0.866 ± 0.031	0.301 ± 0.015	1.74 ± 0.10	9.88 ± 0.79

Note:—TDT indicates tremor-dominant type; ART, akinetic-rigid type.

^*Mean diffusivity values (10⁻³ mm²/s) are reported as mean ± SD.