Selectivity of eligibility criteria
| Criterion | Participants with current asthma excluded (%) |
|---|---|
| Bronchodilator reversibility ⩾15% | 76 |
| Bronchodilator reversibility ⩾12% | 71 |
| Peak flow variability ⩾20% | 66 |
| FEV1 ⩾50% and <80% of predicted | 61 |
| Inhaled corticosteroid use | 48 |
| <10 pack-years of exposure to cigarette | 31 |
| Active symptoms or use of rescue drugs | 20 |
| FEV1 ⩾50% of predicted | 12 |