Coexistence of glottic and supraglottic obstruction
| Inspiratory glottic obstruction | Supraglottic obstruction | |||
| None or minimal | Mild | Moderate | Severe | |
| None or minimal | 1 | 3 | 2 | 0 |
| Mild | 2 | 6 | 25 | 0 |
| Moderate | 0 | 5 | 20 | 1 |
| Severe | 0 | 1 | 4 | 1 |
Data are presented a n patients in whom observed maximal supraglottic obstruction was characterised as none/minimal, mild, moderate and severe respectively in patients stratified by the severity of glottic obstruction.