Table 3.
Swallowing structure DVH parameters (median value and range) and p values for association with GT dependence
| V40 (%) |
V50 (%) |
V60 (%) |
V65 (%) |
Dmax (Gy) |
Dmean (Gy) |
|
|---|---|---|---|---|---|---|
| CE | ||||||
| GT > 192 d | 57 (1-86) | 24 (0-79) | 0 (0-33) | 0 (0-1) | 61 (45-77) | 36 (20-53) |
| GT ≤ 192 d | 65 (17-98) | 27 (0-86) | 0 (0-13) | 0 (0-0) | 57 (44-76) | 36 (21-56) |
| p = 2.671 | p = 0.524 | p = 0.173 | P = 0.169 | p = 0.238 | p = 0.383 | |
| CPI | ||||||
| GT > 192 d | 100 (60-100) | 100 (4-100) | 8 (0-100) | 0 (0-100) | 64 (56-78) | 57 (42-69) |
| GT ≤ 192 d | 100 (93-100) | 95 (3-100) | 0 (0-73) | 0 (0-27) | 58 (53-67) | 53 (43-62) |
| p = 0.512 | p = 0.069 | p = 0.050 | P = 0.062 | p = 0.011 | p = 0.083 | |
| IPC | ||||||
| GT > 192 d | 100 (97-100) | 100 (76-100) | 81 (40-100) | 42 (21-100) | 74 (66-79) | 64 (54-70) |
| GT ≤ 192 d | 100 (95-100) | 92 (40-100) | 37 (10-84) | 15 (0-60) | 72 (68-77) | 55 (46-68) |
| p = 0.367 | p = 0.042 | p = 0.002 | P = 0.003 | p = 0.057 | p = 0.016 | |
| SMPC | ||||||
| GT > 192 d | 100 (60-100) | 100 (56-100) | 94 (45-100) | 72 (21-93) | 76 (66-79) | 67 (38-72) |
| GT ≤ 192 d | 100 (84-100) | 97 (70-100) | 90 (25-100) | 60 (0-95) | 76 (70-79) | 65 (50-71) |
| p = 0.378 | p = 0.072 | p = 0.063 | P = 0.091 | p = 0.252 | p = 0.086 |
Abbreviation: DVH = Dose-volume histogram; GT = gastrostomy tube; SMPC = superior and middle pharyngeal constrictor; IPC = inferior pharyngeal constrictors; CPI = cricoid pharyngeal inlet; and CE = cervical esophagus; Dmax = maximum dose; Dmean = mean dose.