Table 3 The comparison of dosimetric parameters between original and accumulated plans
|  | Original plan (mean ± SD) | Accumulated plan (mean ± SD) | P value | Relative change (median, range) | Above 5% relative reduction/increase* |
|---|---|---|---|---|---|
PTV-GTV | |||||
 V51 (%) | 88.2 ± 6 | 87.6 ± 6.3 | 0.452 | −0.1% (−10–6%) | 3 (11.1%) |
 D95 (Gy) | 48.1 ± 2.0 | 48.0 ± 2.3 | 0.781 | 0.1% (−7.6–5%) | 1 (3.7%) |
 Dmean (Gy) | 52.6 ± 0.5 | 52.6 ± 0.6 | 0.873 | 0.04% (−1–1%) | 0 |
Total lung | |||||
 V20 (%) | 29.5 ± 4.2 | 30.1 ± 4.1 | 0.001 | 1.6% (−3–9%) | 3 (11.1%) |
 V30 (%) | 19.9 ± 4.4 | 20.4 ± 4.4 | 0.004 | 1.9% (−3–16%) | 6 (22.2%) |
 Dmean (Gy) | 16.8 ± 2.1 | 17.0 ± 2.1 | 0.001 | 1.4% (−2–5%) | 1 (3.7%) |
Esophagus | |||||
 Dmax (Gy) | 47.4 ± 1.3 | 49.5 ± 1.8 | <0.001 | 4.1% (−4–15%) | 10 (37.0%) |
 Dmean (Gy) | 26.6 ± 4.2 | 27.1 ± 4.0 | 0.002 | 1.4% (−2–5%) | 1 (3.7%) |
Heart | |||||
 V30 (%) | 13.0 ± 10.1 | 12.9 ± 10.9 | 0.675 | −17.4% (−48.6–16.4%) | 7 (25.9%) |
 V40 (%) | 5.2 ± 5.0 | 4.9 ± 5.1 | 0.168 | −7.1% (−73.9–26.4%) | 8 (29.6%) |
 Dmean (Gy) | 13.0 ± 6.7 | 13.1 ± 7.0 | 0.558 | 1% (−1.9–12.4%) | 5 (18.5%) |