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| Grade 0 | ≤ 20 dB HL at all frequencies |
| Grade 1 | > 20 dB HL (i.e., 25 dB HL or greater) SNHL above 4,000 Hz (i.e., 6 or 8 kHz) |
| Grade 2 | > 20 dB HL SNHL at 4,000 Hz and above |
| Grade 3 | > 20 dB HL SNHL at 2,000 Hz or 3,000 Hz and above |
| Grade 4 | > 40 dB HL (i.e., 45 dB HL or more) SNHL at 2,000 Hz and above |
Abbreviations: HL, hearing loss; SNHL, sensorineural hearing loss.
