. 2014 Aug 6;43(1):30. doi: 10.1186/s40463-014-0030-x

Table 4.

Number of ears with treatment-related hearing loss

	*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

Abbreviations: PTA Pure Tone Average, AC Air Conduction, ISO International Organization for Standardization, SNHL Sensorineural Hearing Loss, RT Radiotherapy, ABG Air Bone Gap.