Table 2.
Pretreatment and treatment characteristics.
| Pretreatment | Median | Mean | Range |
| Dose (Gy) | 36 | 33 | 14 – 50.4 |
| Number of fractions | 15 | 13.9 | 1 – 28 |
| Time to recurrence (months) | 17.2 | 27.9 | 2.5 – 236 |
| Patients with a time to recurrence of less than six months (%) | 5 (9) | ||
| Patients treated with one fraction (%) | 12 (23) | ||
| Patients treated with two to five fractions (%) | 3 (6) | ||
| Patients additionally treated with surgery (%) | 5 (9) | ||
| Treatment | Median | Mean | Range |
| Tumor volume (cc) | 25.7 | 35.5 | 1.5 – 115.5 |
| Prescription dose (Gy) | 18 | 18.7 | 15 – 22 |
| Prescription isodose (%) | 70 | 68.3 | 60 – 75 |
| Max tumor dose (Gy) | 27.1 | 27.4 | 20.7 – 34.5 |
| Min tumor dose (Gy) | 11.7 | 12.5 | 8.3 – 20.3 |
| Max dose spinal cord (Gy) | 13.4 | 13.7 | 1.8 – 21.8 |
| Conformity index | 1.28 | 1.31 | 1.13 – 1.74 |
| Homogeneity index | 1.43 | 1.47 | 1.33 – 1.67 |
| Coverage | 93.7 | 92.5 | 76.6 – 99.9 |
cc, cubic centimeter; Gy, Gray.