Clinical features of patients with occupational asthma resulting from reactive dyes and asymptomatic or challenge negative control subjects
| Patients with occupational asthma from reactive dyes (n=43) | Asymptomatic or challenge negative controls (n=93) | |
| Age (y) | 41.9 (8.3) | 40.3 (8.9) |
| Men:women | 31:11 | 90:3 |
| Atopy to common inhalant allergen (%)1-150 | 22 (52.4) | 30 (32.3) |
| Mean exposure to reactive dyes1-165(months) | 66.3 (59.5) | 129.9 (63.2) |
| Challenge test to reactive dyes (n (%)): | ||
| Early response | 25 (59.5) | |
| Late response | 2 (4.8) | |
| Dual response | 15 (35.7) | |
| Negative response | — | 5 (5.4) |
| Asymptomatic exposed workers (n (%)) | — | 88 (94.6) |