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Table 3: Comparison of histopathologic and quantitative MR imaging parameters between low- and high-grade PITs^{^a}
Parameters Low-Grade Tumor High-Grade Tumor P Value
Conventional DWI parameters 
 ADC_ROI (×10^-3mm²/s) 1.563 (1.275–1.732) 0.834 (0.735–1.269) <.001
 ADC_VOI (×10^-3mm²/s) 1.498 (1.254–1.692) 0.834 (0.725–1.118) <.001
IVIM parameters
 D_ROI (×10^-3mm²/s) 1.515 (1.233–1.724) 0.788 (0.660–1.246) <.001
 D_VOI (×10^-3mm²/s) 1.459 (1.224–1.677) 0.800 (0.668–1.081) <.001
 D*_ROI (×10^-3mm²/s) 82.962 (65.868–96.610) 87.105 (72.954–107.516) .36
 D*_VOI (×10^-3mm²/s) 81.562 (71.791–92.899) 81.271 (76.037–92.996) .43
 f_ROI (%) (mean) 5.479 (SD, 2.603) 6.789 (SD, 2.773) .08
 f_VOI (%) (mean) 5.721 (SD, 2.183) 6.701 (SD, 2.852) .17
DKI parameters
 Dk_ROI (×10^-3mm²/s) 1.899 (1.443–2.062) 1.053 (0.916–1.466) <.001
 Dk_VOI (×10^-3mm²/s) 1.719 (1.440–2.004) 1.044 (0.835–1.353) <.001
 K_ROI (mean) 0.483 (SD, 0.155) 0.887 (SD, 0.329) <.001
 K_VOI (mean) 0.500 (SD, 0.157) 0.912 (SD, 0.288) <.001
Histopathology (19 missing)
 Cellularity (mean) (cells/mm²) 2003 (SD, 769) 3175 (SD, 1161) .001
 Ki-67 (%) 2.315 (0.945–5.310) 40.680 (21.195–66.310) <.001
 MVD (%) 8.280 (4.340–15.400) 10.140 (8.345–19.995) .12
↵a Data are expressed as mean (SD) or medians (lower quartile-upper quartile).