| 1 | 0-16 | Slight: Only heard in quiet environment, very easily masked. No interference with sleep or daily activities. |
| 2 | 18-36 | Mild: Easily masked by environmental sounds and easily forgotten with activities. May occasionally interfere with sleep but not daily activities. |
| 3 | 38-56 | Moderate: May be noticed, even in the presence of background or environmental noise, although daily activities may still be performed. |
| 4 | 58-76 | Severe: Almost always heard, rarely, if ever, masked. Leads to disturbed sleep pattern and can interfere with ability to carry out normal daily activities. Quiet activities affected adversely. |
| 5 | 78-100 | Catastrophic: Always heard, disturbed sleep patterns, difficulty with any activity. |