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Table 3: 
99% normal ranges of absolute asymmetry indices for fiber number, tract volume, and summary statistics of MR parameters across our population of healthy volunteers
Reconstruction TypeNo. of fibersVol.T1T2MTRFAMDλ1λ2λ3λ⊥
No. of individuals2020111715202020202020
Whole brain1.00.640.053 (0.20)0.035 (0.21)0.012 (0.20)0.051 (0.16)0.028 (0.28)0.041 (0.16)0.052 (0.21)0.092 (0.20)0.064 (0.19)
Hemispheres0.560.310.047 (0.13)0.026 (0.17)0.015 (0.23)0.068 (0.20)0.023 (0.19)0.033 (0.20)0.059 (0.19)0.098 (0.18)0.071 (0.20)
Brain stem0.970.540.054 (0.31)0.087 (0.34)0.021 (0.29)0.073 (0.15)0.10 (0.31)0.097 (0.28)0.12 (0.20)0.18 (0.26)0.13 (0.22)
  • Note:—MTR indicates magnetization transfer ratio; FA, fractional anisotropy; MD, mean diffusivity; λ⊥, transverse diffusivity (average of λ2 and λ3). For the MR parameters, cutoffs for medians and interquartile ranges (in parentheses) are given. Data obtained at 3T.