Percentage of asthma cases attributable to atopy, using different cut off levels for total serum IgE
| Serum IgE level (IU/ml) | % Non asthmatics atopic (n =2255) | % Asthmatics atopic (n =160) | Relative risk | % of cases attributable to atopy |
|---|---|---|---|---|
| 640+ | 3.5 | 15.6 | 5.2 | 13 |
| 320+ | 7.0 | 26.9 | 4.9 | 21 |
| 160+ | 11.7 | 38.1 | 4.6 | 30 |
| 80+ | 25.0 | 56.3 | 3.9 | 42 |
| 40+ | 41.4 | 71.3 | 3.5 | 51 |
| 20+ | 57.1 | 81.3 | 3.3 | 56 |
| 10+ | 72.4 | 90.0 | 3.4 | 64 |
| 5+ | 84.8 | 95.0 | 3.4 | 67 |
Adapted from Burrows et al.36