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FIG 3. Radiologic indices are displayed for the six control participants and the six patients with Parkinson's disease. There is no overlap between the groups, which are distinct by Student's t test (P < .00005). The error bars represent one SD.FIG 4. Unified Parkinson's Disease Rating Scale scores for the six patients ranging from 12 to 71 are plotted versus radiologic indices. A linear regression analysis was conducted, yielding a linear correlation coefficient of r = 0.99
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