Table 3 Univariate analysis of associations between dosimetric factors and grade ≥ 3 RP (n = 67)
Variable | Grade 0–2 (n = 49) | Grade ≥ 3 (n = 18) | P value |
|---|---|---|---|
Initial-V5 | 0.047 | ||
≥ 53.15% | 22 (44.9%) | 13 (72.2%) | |
< 53.15% | 27 (55.1%) | 5 (27.8%) | |
Initial-V20 | 0.152 | ||
≥ 18.04% | 23 (46.9%) | 12 (66.7%) | |
< 18.04% | 26 (53.1%) | 6 (33.3%) | |
Initial-V50 | 0.633 | ||
≥ 2.04% | 24 (49.0%) | 10 (55.6%) | |
< 2.04% | 25 (51.0%) | 8 (44.4%) | |
Initial-MLD | 0.002 | ||
≥ 10.87 | 20 (40.8%) | 15 (83.3%) | |
< 10.87 | 29 (59.2%) | 3 (16.7%) | |
Re-V5 | 0.001 | ||
≥ 32.7% | 19 (38.8%) | 15 (83.3%) | |
< 32.7% | 30 (61.1%) | 3 (16.9%) | |
Re-V20 | 0.114 | ||
≥ 9.94% | 22 (44.9%) | 12 (66.7%) | |
< 9.94% | 27 (55.1%) | 6 (33.3%) | |
Re-V50 | 0.532 | ||
≥ 1.25% | 26 (53.1%) | 8 (44.4%) | |
< 1.25% | 23 (46.9%) | 10 (55.6%) | |
Re-MLD | 0.001 | ||
≥ 6.63 | 19 (38.8%) | 15 (83.3%) | |
< 6.63 | 30 (61.2%) | 13 (16.7%) | |
Composite-V5 | < 0.001 | ||
≥ 68.13% | 18 (36.7%) | 16 (88.9%) | |
< 68.13% | 31 (63.3%) | 2 (11.1%) | |
Composite-V20 | 0.033 | ||
≥ 28.04% | 21 (42.9%) | 13 (72.2%) | |
< 28.04% | 28 (57.1%) | 5 (27.8%) | |
Composite-V50 | 0.304 | ||
≥ 7.23% | 23 (46.9%) | 11 (61.1%) | |
< 7.23% | 26 (53.1%) | 7 (38.9%) | |
Composite-MLD | 0.114 | ||
≥ 17.31 | 22 (44.9%) | 12 (66.7%) | |
< 17.31 | 27 (55.1%) | 6 (33.3%) | |
Overlap-V5/Re-V5 | 0.035 | ||
0–0.4 | 12 (24.5%) | 2 (11.1%) | 1.000* |
0.4–0.8 | 10 (20.4%) | 10 (55.6%) | 0.014* |
0.8–1 | 27 (55.1%) | 6 (33.3%) |