Response to skin prick tests and venepuncture, and resulting measures of atopy in responders to stage II1
| Methacholine challenge2 | Yes | No |
|---|---|---|
| n | 856 | 342 |
| With serum sample n′ (%) | 765 (89.3) | 150 (43.9) |
| GM total IgE | 27.2 | 38.2 |
| +ve serum specific IgE: | number (% n′) | |
| Cat | 68 (8.9) | 31 (20.7) |
| D pteronyssinus | 179 (23.4) | 52 (34.7) |
| Timothy grass | 185 (24.2) | 41 (27.3) |
| Cladosporium | 19 (2.5) | 8 (5.3) |
| Birch | 47 (6.1) | 16 (10.7) |
| Skin tested n" (%) | 846 (98.8) | 192 (56.1) |
| Skin prick test >0 mm: | number (% n") | |
| Cat | 105 (12.4) | 37 (19.3) |
| D pteronyssinus | 233 (27.5) | 54 (28.1) |
| Timothy grass | 186 (22.0) | 47 (24.5) |
| Cladosporium | 30 (3.6) | 6 (3.1) |
| Birch | 45 (5.3) | 19 (9.9) |
| Alternaria | 67 (7.9) | 19 (9.9) |
| Olive | 31 (3.7) | 8 (4.2) |
| Parietaria | 8 (1.0) | 4 (2.1) |
| Common ragweed | 12 (1.4) | 7 (3.6) |
1, 2see footnotes to table 1.