Most common attributed causes of occupational asthma in the 844 accepted OA claims 1980–93
| Causative agent | n (%) |
|---|---|
| All agents | 844 (100) |
| Diisocyanates | 425 (50.2) |
| Flour | 52 (6.2) |
| Metals | 31 (3.7) |
| Red cedar | 27 (3.2) |
| Natural rubber latex | 22 (2.6) |
| Plastics | 19 (2.3) |
| Grain | 19 (2.3) |
| Non-cedar wood dusts | 15 (1.8) |
| Welding fumes | 12 (1.4) |
| Soldering fumes | 9 (1.1) |
| Enzymes | 9 (1.1) |
| Other foods or plant products | 11 (1.3) |
| Other probable sensitisers (<1 each) | 35 (4.1) |
| Acids or chlorine | 16 (1.9) |
| Non-isocyanate paints or solvents | 19 (2.3) |
| Not specified or not identified | 122 (14.5) |