| Type | Hearing Recovery |
|---|---|
| 1. Complete Recovery | Final hearing better than 25㏈ |
| 2. Partial Recovery | More than 15㏈ gain, final hearing 25-45㏈ |
| 3. Slight Improvement | More than 15㏈ gain, final poorer than 45㏈ |
| 4. No Improvement | Less than 15㏈ gain, final hearing 75㏈ |