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Comparison of the frequency of triple therapy using the GOLD 2011 classification.
Notes: The frequency is 9% in GOLD A (%FEV1 ≥50% and CAT <10), 28% in GOLD B (%FEV1 ≥50% and CAT ≥10), 21% in GOLD C (%FEV1 <50% and CAT <10), and 37% in GOLD D (%FEV1 <50% and CAT ≥10). The frequency is higher in GOLD D than in GOLD A (P<0.001).
Abbreviations: GOLD, Global initiative for chronic Obstructive Lung Disease; FEV1, forced expiratory volume in 1 second; CAT, COPD Assessment Test.
