Forced expiratory volume in one second (FEV1) at rest and after β2-agonist therapy, and the maximum relative fall in FEV1 after cold dry-air hyperventilation challenge (CACh) in the three subgroups
| A | B | C | p-values | |||
| A vs B | A vs C | B vs C | ||||
| Subjects n | 27 | 16 | 12 | |||
| Resting FEV1 % pred | 95.3 ±12.5 | 89.6±7.5 | 88.2±11.3 | ns | ns | ns |
| Max. fall in FEV1 % | 4.7±2.8 | 14.2±3.1 | 37.6±8.9 | <0.001 | <0.001 | <0.001 |
| Post-β2 FEV1 % pred | 99.1±12.8 | 92.8±6.3 | 90.7±12.2 | ns | ns | ns |
Data are presented as mean±sd
A: nonresponders
B: minor responders
C: major responders
vs: versus
% pred: % predicted
max.: maximum
ns: nonsignificant