Table 4.
Comparison of dosimetric values of patients with and without radiation pneumonitis.
| Variable | Occurrence of grade ≥ 2 RP | Occurrence of grade ≥ 3 RP | ||||
|---|---|---|---|---|---|---|
| Patients with RP | Patients without RP | P-value | Patients with RP | Patients without RP | P-value | |
| Total lung | ||||||
| V5 (%) | 52.5 ± 9.4 | 37.6 ± 15.0 | < 0.01 | 49.8 ± 10.2 | 42.1 ± 15.5 | 0.20 |
| V20 (%) | 24.1 ± 5.3 | 16.1 ± 6.8 | < 0.01 | 21.6 ± 5.2 | 18.6 ± 7.6 | 0.26 |
| V40 (%) | 13.2 ± 4.2 | 7.9 ± 4.8 | < 0.01 | 11.7 ± 4.7 | 9.6 ± 5.3 | 0.24 |
| Contralateral lung | ||||||
| V5 (%) | 33.4 ± 14.1 | 25.9 ± 18.4 | 0.10 | 30.5 ± 16.6 | 28.5 ± 17.4 | 0.83 |
| V20 (%) | 6.1 ± 5.5 | 5.1 ± 6.4 | 0.19 | 4.5 ± 5.3 | 5.7 ± 6.2 | 0.82 |
| V40 (%) | 1.9 ± 2.4 | 1.6 ± 2.8 | 0.27 | 1.4 ± 2.1 | 1.8 ± 2.7 | 0.68 |
RP radiation pneumonitis, V5 lung volume receiving a dose of ≥ 5 Gy, V20 lung volume receiving a dose of ≥ 20 Gy, V40 lung volume receiving a dose of ≥ 40 Gy.