* Compared with control, P<0.05;
† Compared with mild asthma, P<0.05;
‡ Compared with moderate asthma, P<0.05;
§ Compared with severe asthma, P<0.05.
Multiple-group comparisons were made by using one-way ANOVA, Bonferroni
correction was applied to adjust for multiple comparisons.
Abbreviation: FEV1: forced expiratory volume in
one second; FVC: forced vital capacity; MMEF: maximal mid-expiratory
flow; ICS: inhaled corticosteroid.