Secondary |
Allard |
1989 |
Canada |
Both |
Various |
N/A |
Various occupations (Includes cohort reported by Hudson, 1985) |
Occupational asthma |
Removal from exposure (mean: 2.3 years, 5.8 years) |
26 of 32 eligible subjects (Participation rate: 81%) |
All subjects (n=26) were symptomatic at both follow-ups. There were no changes in medication use, spirometry, or bronchial hyperresponsiveness. Increased bronchial hyperresponsiveness was associated with duration of exposure after onset of symptoms. |