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Amount of mucus within each section of the circuit
| Location | Group 1 (%) | Group 2 (%) |
| Mouth piece/proximal filter | 0 | 0 |
| Proximal ETT | 26.8 ± 0.63 | 0 |
| Mid-ETT (portion 23-27cm) | 0 | 17 ± 1.04 |
| Distal ETT | 51.2 ± 1.75 | 80 ± 4.2 |
| Lung/distal filter | 22 ± 0.55 | 3 ± 1.04 |
ETT: Endotracheal tube.
