Table 1.

Inclusion and exclusion criteria

Inclusion	Exclusion
English language Studies that consider the costs of asthma medications Studies from 1990 onwards	Conference abstracts, case reports, letters, comments, editorials, and review papers Studies that consider asthma with other comorbidities (such as allergies, COPD) Studies that didn’t quote costs in the results section Non-RCT trials Animal or in vitro studies

Abbreviations: COPD, chronic obstructive pulmonary disease; RCT, randomized controlled trials.