Table 2.
Definitions and distributions of the eight quantitative volumetric, kinetic, and clinical variables used in this investigation
| Variable used for Investigation | Definition | Male | Female | ||||
|---|---|---|---|---|---|---|---|
| Mean | Median | Range | Mean | Median | Range | ||
|
Age (years) |
Age of patient on date of diagnosis | 57.58 | 58 | 12–95 | 58.41 | 60.5 | 9–96 |
|
T1Gd Radius (mm) |
Combined volume of the central non-enhancing necrotic region and surrounding enhanced region of tumor in a pre-tx T1Gd MR image (converted to a spherically- equivalent radius) | 19.52 | 20.10 | 3.04–33.61 | 19.27 | 18.99 | 4.61–35.08 |
| Necrosis Radius (mm) | Volume of non-enhancing central necrotic region in a pre-tx T1Gd MR image (converted to a spherically- equivalent radius) | 11.39 | 11.69 | 0.00–26.54 | 11.37 | 11.33 | 0.00–27.06 |
| Contrast- enhancing (CE) thickness (mm) | Average linear thickness of the contrast-enhancing region in a pre-tx T1Gd MR image (calculated as the difference between the T1Gd radius and the necrosis radius) | 8.16 | 7.85 | 2.55–18.94 | 7.89 | 7.59 | 0.32–23.26 |
| T2 /FLAIR radius (mm) | Volume of the pre-tx T2 or T2-FLAIR MR image (converted to a spherically- equivalent radius) | 27.11 | 28.31 | 9.94–39.55 | 26.98 | 27.86 | 9.99–42.81 |
| PIHNA D (mm2/year) | Net tumor cell diffuse invasion rate | 32.34 | 28.99 | 1.45–145.3 | 36.25 | 23.03 | 0.37–289.9 |
| PIHNA ϱ (year −1) | Net tumor cell proliferation rate | 65.88 | 18.25 | 1.83–1825 | 82.40 | 18.25 | 1.83–1825 |
| PI D/ϱ (mm2) | Relative tumor invasiveness | 2.19 | 1.65 | 0.0034–10.26 | 2.12 | 1.28 | 0.0034–10.70 |