Baseline disease figures for prevalence of the different disease states (per 1000 workers)
| Disease state | Prevalence (97.5% CI) |
| Work related sensitisation | 134 (106 to 163) |
| Upper respiratory symptoms | 100 (80 to 123) |
| Lower respiratory symptoms | 64 (41 to 110) |
| Work disabling asthmatic symptoms | 3 (0.2 to 5) |