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Table 1 Gradation of respiratory and digestive signs in 50 brachycephalic dogs suffering from BAOS

From: Evaluation of C-reactive protein, Haptoglobin and cardiac troponin 1 levels in brachycephalic dogs with upper airway obstructive syndrome

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%