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

Table 2 Measured hearing levels in decibel at pure tone averages

	0.5-1-2 kHz AC mean (SD) median	1-2-4 kHz AC mean (SD) median	8-10-12.5 kHz mean (SD) median	0.5-1-2 kHz BC mean (SD) median	1-2-4 kHz BC mean (SD) median
Number of ears	72	72	67	66	66
Before treatment	20.3 (13.3) 16.7	28.6 (16.8) 25.0	75.4 (23.6) 74.8	17.4 (12.2) 14.1	24.3 (35.1) 20.8
ST after treatment	20.3 (15.4) 15.8	29.2 (18.9) 25.0	78.3 (22.3) 79.0	16.6 (12.7) 13.3	22.9 (15.1) 20.9
LT after treatment	22.1 (15.7) 18.3	31.5 (19.0) 29.2	82.7 (23.3) 82.9	17.3 (12.9) 13.3	23.2 (15.1) 20.0
Difference ST and BT	0 dB	0.6 dB	2.9 dB*	−0.8 dB	−1.4 dB
Difference LT and ST	1.8 dB	2.3 dB*	4.4 dB*	0.7 dB	0.3 dB

Abbreviations: ST Short-term, LT Long-term, BT Before Treatment, AC Air Conduction, BC Bone Conduction, SD Standard deviation, dB Decibel.
*Statistically significant (p < 0.05).

ISSN: 1916-0216