Nonatopic | Atopic | |||||
1992–1993 | 1998–1999 | p-value | 1992–1993 | 1998–1999 | p-value | |
Mean FEV1 % pred (SEM) | 103.4 (0.69) | 104.9 (0.72) | 0.13 | 101.6 (1.2) | 103.1 (0.99) | 0.32 |
PD20 <6400 µg | 30.6 | 26.5 | 0.187 | 57.5 | 43.2 | 0.01 |
PD20 <1000 µg | 16.4 | 10.6 | 0.014 | 41.1 | 30.7 | 0.052 |
PD20 <200 µg | 5.8 | 3.5 | 0.115 | 19.2 | 17.1 | 0.62 |
Geometric mean DRS | 0.00377 | 0.00272 | 0.004 | 0.0145 | 0.00832 | 0.038 |
Data are presented as % unless otherwise stated.
FEV1: forced expiratory volume in one second
PD20: provocative concentration causing a 20% fall in FEV1
DRS: dose/response slope