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Table 5 Classification of tracheomalacia [47]

From: Adolescent and adult laryngotracheal stenosis: a review

Absent 0% respiration related airway occlusion
Mild 1–33% respiration related airway occlusion
Moderate 34–66% respiration related airway occlusion
Severe > 66% respiration related airway occlusion
  1. Source: Gustafson et al. 2000 [47]