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Table 1: Mean ± SD for rCBV histogram measures
Grade
II III IV
Median 1.14 ± 0.49 2.86 ± 1.13 2.72 ± 0.68
Mean 1.24 ± 0.47 2.90 ± 0.83 2.83 ± 0.68
SD 0.49 ± 0.32 2.31 ± 0.32 2.32 ± 0.29
Mean₅₀ 1.58 ± 0.58 3.65 ± 0.93 3.63 ± 0.86
SD₅₀ 0.46 ± 0.36 1.96 ± 0.31 1.94 ± 0.32
Mean₂₅ 1.85 ± 0.66 4.12 ± 0.82 4.12 ± 0.81
SD₂₅ 0.38 ± 0.33 1.80 ± 0.34 1.70 ± 0.33
Mean₁₀ 2.18 ± 0.76 4.55 ± 0.76 4.46 ± 0.71
SD₁₀ 0.35 ± 0.33 1.64 ± 0.42 1.54 ± 0.31
Skew 1.07 ± 0.83 0.46 ± 1.12 0.46 ± 0.78
Kurt 1.60 ± 3.04 0.59 ± 3.43 −0.26 ± 1.18
PH 0.22 ± 0.09 0.20 ± 0.18 0.19 ± 0.16
PP 1.10 ± 0.61 3.28 ± 1.85 3.34 ± 1.75
A1SD 0.66 ± 0.11 0.55 ± 0.20 0.55 ± 0.18
Note:—rCBV indicates relative cerebral blood volume; mean_50, mean of the top 50% of the histogram; SD₅₀, SD of the top 50%; mean₂₅, mean of the top 25%; SD₂₅, SD of the top 25%; mean₁₀, mean of the top 10%; SD₁₀, SD of the top 10%; skew, skewness; kurt, kurtosis; PH, peak height of the histogram; PP, peak position (ie, the mode); and A1SD, area under the histogram curve within 1 SD.