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Time to first COPD exacerbation of any severity in (A) all patients; (B) patients in GOLD Groups A and C; and (C) patients in GOLD Groups B and D (ITT population). COPD, chronic obstructive pulmonary disease; GOLD, Global initiative for chronic Obstructive Lung Disease; HR, hazard ratio; ITT, intent-to-treat; N, number of patients.
