Secondary |
Perfetti |
1998 |
Canada |
Both |
Various |
N/A |
Various occupations (Includes cohort reported by Allard, 1989, Hudson, 1985) |
Occupational asthma |
Removal from exposure (> 5 years, or = 5 years) |
99 of 242 eligible subjects (Participation rate: 41%) |
The proportion of subjects with normal PC20 at follow-up was higher in the > 5 yrs group (n=48) than the = 5 yrs group (n=51) (p=0.01). Follow-up PC20 could be predicted from baseline PC20 (p<0.001), duration of exposure (p=0.04), interval of removal from exposure (p=0.02), and type of agent. Exposure to HMW agents predicted a less favorable outcome (p=0.04). |