Table 1.
Brock's hearing loss grade.
| Grade | Frequencies |
|---|---|
| Grade 0 | All frequencies < 40Db |
| Grade 1 | >40 dB loss at 8 kHz |
| Grade 2 | >40 dB loss at 4 kHz and 8KHz |
| Grade 3 | >40 dB loss at 2KHz, 4kHZ and 8KHz |
| Grade 4 | >40 dB loss at 1KHz,2KHz, 4kHZ and 8KHz |
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