| Inclusion Criteria | Exclusion Criteria |
|---|---|
| • English language | • Conference abstracts, case reports, letters, comments, editorials and review papers |
| • Studies that consider the costs of asthma from either the individuals', the health services', and/or society's perspective | • Studies that consider asthma with other comorbidities (such as allergies, COPD, etc) |
| • Pharmacodynamic or pharmacokinetic studies | |
| • Studies that did not quote costs in the results section | |
| • Animal or in vitro studies |