Incidence of Cisplatin Induced Ototoxicity in Adults with Head and Neck Cancer

Table 2

Chang classification of cisplatin induced hearing loss [7].

Grade	Sensorineural hearing threshold (db HL)
0	≤20 dB at 1, 2, and 4 kHz
1a	≥40 dB at any frequency 6–12 kHz
1b	>20 and >40 dB at 4 kHz
2a	≥40 dB at 4 kHz and above
2b	>20 and <40 dB at any frequency below 4 kHz
3	≥40 dB at 2 or 3 kHz and above
4	≥40 dB at 1 kHz and above