Table 3.
Correlation of Radiation Dosimetric Parameters of Cochlea with SNHL (102 Ears)
| Parameters | Cutoff | Incidence Above Cutoff | Incidence Under Cutoff | P | OR | 95% CI |
|---|---|---|---|---|---|---|
| V30 | 69.0% | 15.7% (13/83) | 0.0% (0/19) | .120⁎ | - | - |
| V40 | 32.0% | 15.1% (8/53) | 10.2% (5/49) | .559 | 1.56 | 0.48-5.15 |
| V50 | 14.0% | 23.1% (7/37) | 9.0% (6/65) | .217 | 3.05 | 0.71-7.45 |
| V60 | 35.0% | 21.1% (3/18) | 12.6% (10/84) | .696⁎ | 1.48 | 0.36-6.03 |
| V70 | 1.0% | 15.4% (2/13) | 12.4% (11/89) | .670⁎ | 1.29 | 0.25-6.60 |
| Mean dose | 38Gy | 17.3% (9/52) | 8.0% (4/50) | .236 | 2.41 | 0.69-8.39 |
| Dmin | 32.2Gy | 15.4% (6/39) | 11.1% (7/63) | .553 | 2.11 | 0.45-4.70 |
| Dmax | 54.0Gy | 18.4% (7/38) | 9.4% (6/64) | .225 | 2.18 | 0.68-7.06 |
| Median dose | 34.0Gy | 17.9% (13/82) | 0.0% (0/20) | .067⁎ | - | - |
| EUD (a= 100) | 52.0Gy | 21.6% (7/37) | 7.7% (6/65) | .063⁎ | 3.30 | 1.00-11.00 |
| D0.100 ml | 39.8Gy | 20.0% (11/55) | 4.3% (2/47) | .017 | 5.63 | 1.18-26.85 |
| D0.035 ml | 50.0Gy | 23.1% (8/38) | 9.0% (5/64) | .053 | 3.15 | 0.95-10.45 |
Abbreviations: Dmin: minimum dose; Dmax: maximum dose.
⁎
Fisher’s exact test was used.