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Incidence of pepsin in tracheal secretions from the experimental and control animals
| Tracheal secretions positive for pepsin | Tracheal secretions negative for pepsin | |
|---|---|---|
| 2-hour |
||
| Experimental animals | 155/160 (96.9%) | 5/160 (3.1%) |
| Control animals | 0/17 (0.0%) | 17/17 (100.0%) |
| 4-hour |
||
| Experimental animals | 150/161 (93.2%) | 11/161 (6.8%) |
| Control animals | 0/19 (0.0%) | 19/19 (100.0%) |
| 6-hour |
||
| Experimental animals | 149/158 (94.3%) | 9/158 (5.7%) |
| Control animals | 0/20 (0.0%) | 20/20 (100.0%) |
