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Table 2: CBF and ATT for patients with VB disease and controls separated by group and ROI
Control (n = 20) Patient (n = 21) Between-GroupsP Value Within-VBP Value
Mean SD Mean SD
CBF (mL/100 g/min) 
    PAR 29.7 7.5 24.9 10.1 0.096 0.459
    OCC 31.8 10.5 21.8 9.9 0.003^a 0.371
CBF-sig (mL/100 g/min) 
    PAR 31.3 6.5 27.9 8.7 0.161 0.359
    OCC 32.4 10.1 22.6 9.6 0.003^a 0.307
ATT (s) 
    PAR 0.75 0.10 0.84 0.20 0.094 0.763
    OCC 0.82 0.11 0.87 0.34 0.599 0.026^b
ATT-sig (s) 
    PAR 0.73 0.08 0.76 0.13 0.438 0.059
    OCC 0.82 0.10 0.81 0.26 0.918 0.010^b
Note:—The percentage of significant voxels for CBF and ATT are shown (ie, % CBF-sig voxels and % ATT-sig voxels). ROI-adjusted CBF-sig and ATT-sig are shown, achieved by excluding voxels with a poor fit. For group comparison, a indicates a significant difference (P < .05). For within-VB analysis, b indicates a significant within-VB difference (P < .05). OCC indicates occipital cortex; PAR, parietal cortex.