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Distribution of histological tracheal lesions
| Animals with the pneumatic device (n = 6) | Animals without the pneumatic device (n = 6) | |
| Grade I lesions | 6 (100) | 6 (100) |
| Grade II lesions | 6 (100) | 6 (100) |
| Grade III lesions | 0 (0) | 0 (0) |
Results presented as n (%).
