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Table 1 Suggested Indices Of Severity Of Airway Obstruction

From: The Hoover's Sign of Pulmonary Disease: Molecular Basis and Clinical Relevance

Physical findings Pursed lip breathing
  Intercostal retraction (Hoover Sign)
  Accessory muscle use
  Cyanosis
  Hoover's sign?
Laboratory Parameters Pulmonary function (FEV1 and FEV1/FVC)
  Peak Expiratory Flow Rate
  Hypoxemia