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| Ambu PEEP 5 (cmH2O) | Ambu (cmH2O) | Laerdal LSR Silicone (cmH2O) | Laerdal PVC (cmH2O) | Rüsch (cmH2O) | |
| Day 0 | 12.5 | 7.3 | 7.7 | 8.6 | 7.0 |
| Day 7 | 12.3 | 7.3 | 7.2 | 8.5 | 6.9 |
| Day 30 | 6.5 | ||||
| Day 45 | 6.6 | ||||
| Percent difference | 1.0 | 0.3 | 3.2 | 0.2 | 3.8 |
