Figure 2.

Proportion of COPD patients using various classes of inhaled respiratory medications, after stratification for GOLD stage. Black bars, short-acting bronchodilators; light gray bars, long-acting bronchodilators; dark gray bars, inhaled corticosteroids.

Notes: Significance of differences between GOLD COPD stages is indicated by: ***P < 0.001, *P < 0.05 versus GOLD 1; ^###P < 0.001 versus GOLD 2; ^†††P < 0.001, ^†P < 0.05 versus GOLD 3.

Abbreviations: COPD, chronic obstructive pulmonary disease; GOLD, Global Initiative for Chronic Obstructive Lung Disease.