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| Category | Criteria |
| 0 | No awareness of environmental sounds |
| 1 | Awareness of environmental sounds |
| 2 | Response to speech sounds |
| 3 | Identification of environmental sounds |
| 4 | Discrimination of some speech sounds without lip-reading |
| 5 | Understanding of common phrases without lip-reading |
| 6 | Understanding of conversation without lip-reading |
| 7 | Use of telephone with known listener |
