Mode of classification of sleep study results
| Snoring | Movement | Sao 2dips | |
| Normal score = 1 | Minimal | Little: not related to breathing | None |
| Mild score = 2 | Quiet, intermittent | Some related to breathing | None or occasional |
| Moderate score = 3 | Louder for longer periods | Definitely related to breathing | Some, but not below 90% |
| Severe score = 4 | Loud, almost continuous | Frequent and related to breathing | Many, some below 90% |