Table 2

 Patient characteristics

No of patients
FEV1, forced expiratory volume in 1 second; CS, corticosteroids.
*FEV1 expressed as % of the expected value for age, length and weight.
†Disease severity based on revised GINA criteria.12
% FEV1 <70% of expected value*3 (1 on CS)
% FEV1 70–90% of expected value*9 (3 on CS)
Mild intermittent asthma†11 (0 on CS)
Mild persistent asthma†12 (1 on CS)
Moderate persistent asthma†8 (5 on CS)
Severe persistent asthma†8 (7 on CS)