Table 2. PTV dosimetric parameters with and without HP sparing.
| Parameter | Non-sparing (Gy) | Sparing (Gy) | P-value | |
| PTV70 | Dmax | 77.60±1.44 | 77.58±1.42 | 0.68 |
| D2% | 75.53±0.70 | 75.48±0.68 | 0.50 | |
| Dmean | 73.36±0.50 | 73.32±0.53 | 0.18 | |
| Dmedian | 72.76±0.42 | 72.75±0.42 | 0.69 | |
| D98% | 69.59±0.16 | 69.58±0.18 | 0.18 | |
| Dmin | 64.79±1.22 | 64.68±1.19 | 0.15 | |
| PTV59.4 | Dmax | 77.30±1.42 | 77.28±1.43 | 0.35 |
| D2% | 76.20±0.63 | 76.18±0.60 | 0.45 | |
| Dmean | 65.40±0.45 | 65.40±0.44 | 0.35 | |
| Dmedian | 64.40±0.37 | 64.19±0.25 | 0.18 | |
| D98% | 59.09±0.14 | 59.03±0.20 | 0.08 | |
| Dmin | 51.83±1.33 | 51.79±1.38 | 0.20 |
Data presented as mean±standard deviation. Two-tailed P values from paired t tests. Abbreviation: PTV = planning target volume; Dmax = maximum dose; Dmean = mean dose; Dmedian = median dose; Dmin = minimum dose; D2% = the dose delivered to 2% of the target volume; D98% = the dose delivered to 98% of the target volume.