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Table 2 Brock ototoxicity grading scale

From: Low early ototoxicity rates for pediatric medulloblastoma patients treated with proton radiotherapy

FREQUENCY (kHz) GRADE
- 0
8 1
4 2
2 3
1 4
  1. On this scale, ototoxicity is graded by the lowest frequency level at which a hearing threshold loss of at least 40 dB occurs [19]. If no threshold loss of this magnitude is detected at or below 8 kHz, the toxicity grade is zero.