Hyperintense putaminal rim at 1.5 T: prevalence in normal subjects and distinguishing features from multiple system atrophy

Table 4 The mean MD values of the putamen of the three groups

		MD value(×10⁻³ s mm⁻²)		P-value
		Mean ± standard variation	Range	P-value
Normal subjects	with HPR	0.75 ± 0.03	0.66–0.85	0.07♠
	without HPR	0.76 ± 0.02	0.71–0.82
MSA-P	with HPR	1.16 ± 0.33	0.81–1.60	<0.0001 (F = 15.76, df = 37)* among groups^#; <0.0001* between MSA-P and normal or MSA-C♣; 0.0003* between MSA-C and normal♣
MSA-C	with HPR	0.89 ± 0.14	0.78–1.23
Normal subjects (age and gender-matched to the patients)	with HPR	0.76 ± 0.04	0.66–0.85

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