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Figure 3: Mean (SE) total scores for the D-12 questionnaire with participants grouped according to their disease severity, using grades defined by the Global Initiative for Chronic Obstructive Lung Disease (GOLD). *P = 0.01

Figure 3: Mean (SE) total scores for the D-12 questionnaire with participants grouped according to their disease severity, using grades defined by the Global Initiative for Chronic Obstructive Lung Disease (GOLD). *<i>P</i> = 0.01