Characteristics of subjects with asthma
| Subject no. | Age yrs | Sex | FEV1 % pred | PD20 histamine μg | Allergen | SPT mm | PD20 allergen SQ units | Late reaction | PD5 allergen SQ units |
| 1 | 32 | F | 85 | 620 | Birch | 5.5 | 500 | No | 100 |
| 2 | 25 | F | 96 | 788 | Cat | 9.5 | 350 | No | 14 |
| 3 | 40 | F | 106 | 1864 | Cat | 9.5 | 1525 | Yes | 213 |
| 4 | 29 | F | 81 | 420 | Birch | 6.5 | 500 | Yes | 21 |
| 5 | 29 | F | 89 | 128 | Cat | 12.0 | 170 | Yes | 7 |
| 6 | 41 | F | 103 | 197 | Timothy | 14.5 | 27 | No | 7 |
| 7 | 32 | F | 98 | 186 | Cat | 8.5 | 350 | Yes | 112 |
| 8 | 26 | M | 102 | 1069 | Cat | 14.5 | 270 | No | 42 |
| Mean (range) | 95 (81–106) | 457 (128–1864)# | 295 (27–1525)# | 33 (7–213)# |
FEV1: forced expiratory volume in one second; % pred: per cent predicted; PD20: provocative dose causing a 20% fall in FEV1; standardised quality; SPT: skin-prick test mean diameter; PD5: provocative dose causing a 5% fall in FEV1; F: female; M: male. #: geometric mean.