Figure 2.

The percentage of antiasthmatic drug used by patients with asthma/CVA according to the duration of cough. The percentage of ICS use increased according to the duration of cough (acute, 42%; subacute, 70%; chronic, 100%). The percentage of LTRA use also increased according to the duration of cough (acute, 30%; subacute, 40%; chronic, 60%). The percentage of LABA use decreased according to the duration of cough (acute, 58%; subacute, 42%; chronic, 40%). The percentages of sustained-release theophylline use did not correlate with the duration of asthma (acute, 40%; subacute, 20%; chronic, 29%).

Abbreviations: CVA, cough variant asthma; ICS, inhaled corticosteroids; LABA, long-acting β₂-agonists; LTRA, leukotriene receptor antagonist.