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Table 4 Number of ears with treatment-related hearing loss

From: Cochlea sparing effects of intensity modulated radiation therapy in head and neck cancers patients: a long-term follow-up study

  Number (ears) Number (ears) with more hearing loss than expected according to ISO Explanation
PTA 0.5-1-2 kHz BC 66 2 (3%) 2x: SNHL, RT dose to cochlea >45 Gy
PTA 1-2-4 kHz BC 66 2 (3%) 2x: SNHL, RT dose to cochlea >45 Gy
PTA 0.5-1-2 kHz AC 72 3 (4%) 2x: SNHL, RT dose to cochlea >45 Gy 1x: ABG
PTA 1-2-4 kHz AC 72 4 (6%) 2x: SNHL, RT dose to cochlea >45 Gy 2x: ABG
PTA 8-10-12.5 kHz 67 7 (10%) 2x: SNHL, RT dose to cochlea >45 Gy 2x: ABG at PTA 1-2-4 kHz 3x: Unexplained
  1. Abbreviations: PTA Pure Tone Average, AC Air Conduction, ISO International Organization for Standardization, SNHL Sensorineural Hearing Loss, RT Radiotherapy, ABG Air Bone Gap.