Grade of clinical signs | Respiratory signs | Grade of clinical signs | Digestive signs | ||
---|---|---|---|---|---|
 | (stertors, snoring, inspiratory efforts, stress, exercise intolerance, syncope) |  | (regurgitation, vomiting) | ||
 | n | % |  | n | % |
Grade 0- Absent | 0 | 0% | Grade 0- Absent | 6 | 12% |
Grade 1-Mild Stertors during exercise (<once week) | 1 | 2% | Grade 1-Mild (< once week) | 23 | 46% |
Grade 2-Moderate Continuous stertor (< once daily) | 13 | 26% | Grade 2-Moderate (< once daily) | 14 | 28% |
Grade 3-Severe Exercice intolerance, cianosis (>once daily) | 36 | 72% | Grade 3-Severe (> once daily) | 7 | 14% |