Descriptive Statistics of Continuous PET Variables by Tumor Types
| Tumor type | n | Minimum | Median | Maximum | P* |
| Mean tumor 18F-FDG uptake/GM | |||||
| Anaplastic astrocytoma RR | 25 | 0.38 | 0.85 | 2.35 | |
| Astrocytoma/astrocytic glioma RR | 20 | 0.35 | 0.70 | 2.68 | |
| BSG RR | 16 | 0.13 | 0.49 | 0.88 | 0.067 |
| BSG ND | 45 | 0.38 | 0.61 | 1.23 | |
| Ependymoma RR | 9 | 0.48 | 0.59 | 0.80 | |
| GBM RR | 15 | 0.55 | 0.68 | 2.59 | 0.23 |
| GBM ND | 8 | 0.55 | 1.02 | 1.45 | |
| Medulloblastoma RR | 8 | 0.62 | 0.84 | 1.29 | |
| Maximum tumor 18F-FDG uptake/GM | |||||
| Anaplastic astrocytoma RR | 25 | 0.45 | 0.97 | 3.44 | |
| Astrocytoma/astrocytic glioma RR | 20 | 0.41 | 0.81 | 3.69 | |
| BSG RR | 16 | 0.33 | 0.51 | 0.90 | 0.053 |
| BSG ND | 45 | 0.38 | 0.63 | 1.48 | |
| Ependymoma RR | 9 | 0.48 | 0.65 | 0.84 | |
| GBM RR | 15 | 0.60 | 0.80 | 3.14 | 0.25 |
| GBM ND | 8 | 0.72 | 1.15 | 2.50 | |
| Medulloblastoma RR | 8 | 0.63 | 0.92 | 1.37 | |
| Mean tumor 18F-FDG uptake/WM | |||||
| Anaplastic astrocytoma RR | 25 | 0.82 | 1.42 | 3.15 | |
| Astrocytoma/astrocytic glioma RR | 20 | 0.87 | 1.70 | 4.37 | |
| BSG RR | 16 | 0.97 | 1.18 | 1.71 | 0.23 |
| BSG ND | 45 | 0.71 | 1.28 | 2.89 | |
| Ependymoma RR | 9 | 0.85 | 1.59 | 2.43 | |
| GBM RR | 15 | 1.26 | 1.55 | 6.36 | 0.042 |
| GBM ND | 8 | 1.51 | 2.93 | 5.77 | |
| Medulloblastoma RR | 8 | 1.18 | 2.40 | 3.91 | |
| Maximum tumor 18F-FDG uptake/WM | |||||
| Anaplastic astrocytoma RR | 25 | 0.77 | 1.54 | 6.45 | |
| Astrocytoma/astrocytic glioma RR | 20 | 0.81 | 1.75 | 5.47 | |
| BSG RR | 16 | 0.63 | 1.07 | 1.65 | 0.26 |
| BSG ND | 45 | 0.67 | 1.23 | 2.85 | |
| Ependymoma RR | 9 | 0.89 | 1.42 | 2.25 | |
| GBM RR | 15 | 1.00 | 1.55 | 7.17 | 0.032 |
| GBM ND | 8 | 1.36 | 2.92 | 8.76 | |
| Medulloblastoma RR | 8 | 1.27 | 2.04 | 4.18 |
↵* P value is from Wilcoxon–Mann–Whitney test comparing ND vs. RR.