Table 4:

FA histogram parameters*

	Percentile			Mean	SD	Skewness	Kurtosis
	25th	50th	75th	Mean	SD	Skewness	Kurtosis
Controls	0.155 ± 0.012	0.241 ± 0.021	0.356 ± 0.026	0.285 ± 0.018	0.190 ± 0.009	1.97 ± 0.17	8.59 ± 0.86
PD Patients	0.166 ± 0.013^†	0.256 ± 0.023	0.377 ± 0.030	0.297 ± 0.020	0.190 ± 0.006	1.87 ± 0.20	8.14 ± 0.95
ART-PD	0.172 ± 0.015^†	0.265 ± 0.026^‡	0.386 ± 0.031^‡	0.303 ± 0.022^‡	0.190 ± 0.008	1.82 ± 0.16^‡	7.98 ± 0.85
TDT-PD	0.164 ± 0.012^‡	0.253 ± 0.020	0.377 ± 0.028	0.296 ± 0.017	0.191 ± 0.004	1.86 ± 0.21	8.01 ± 0.97

Note:—TDT indicates tremor-dominant type; ART, akinetic-rigid type.
* FA values (unitless) are reported as mean ± SD.
† Significantly different (P ≤ .01) with respect to control subjects.
‡ Trend for an increase/decrease (.01 < P ≤ .05) with respect to control subjects.