| Study | Reason for exclusion |
|---|---|
| Bisgaard 2006 | Treatments assigned and initiated at less than 1 year of age |
| Boushey 2005 | No placebo group |
| Durmaz 2011 | Treatments assigned and initiated at less than 1 year of age. |
| Haahtela 2006 | Excluded as formoterol is recognised as having long‐acting effects as a beta‐agonist |
| Hamada 2008 | No placebo group |
| Jenkins 2006 | No placebo group |
| Papi 2011 | Duration of follow up < 12 weeks, this is the same study at Papi 2009 with only 1 week outcomes reported |
| Turpeinen 2008 | No placebo group and crossover |
| Zeiger 2011 | No placebo group |
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