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Table 1 Global Initiative for Chronic Obstructive Lung Disease (GOLD) Grading system for COPD (Adapted from reference #) [[1]]

From: Chronic obstructive pulmonary disease and glucose metabolism: a bitter sweet symphony

Grade Severity Spirometry findings
GOLD 1 Mild FEV 1 /FVC<0.7 and FEV 1 ≥80% predicted
GOLD 2 Moderate FEV 1 /FVC<0.7 and 50%≤FEV 1 ≥80% predicted
GOLD 3 Severe FEV 1 /FVC<0.7 and 30%≤FEV 1 ≥50% predicted
GOLD 4 Very Severe FEV 1 /FVC<0.7 and FEV 1 >30% predicted
  1. Abbreviations: GOLD: Global Initiative for Chronic Obstructive Lung Disease; FEV 1 : Forced Expiratory Flow in 1 second; FVC: Forced Vital Capacity.