|Molecular Weight of Agent||Both|
|Occupation|| Not specified|
|Activity Intervention|| Removal from exposure (average: 6.5 years)|
|Participation Rate||Limitation: no report of participation rate.
There were two groups: 37 patients with occupational asthma and 19 patients without asthma or rhinitis for control group.
|Intervention Effectiveness||For patients with occupational asthma:
1. There were no significant differences between the results in asthmatics at first and recent visit.
2. Symptoms of bronchial asthma persisted in 86.5% (32 persons).
3. Positive results of the present histamine challenge test and elevated eosinophiles in sputum were more often (P<0.05) in patients exposed to HMW than exposed to LMW.
Comparison of the results for occupational asthma group and control group: More positive results for occupational asthma group than control group for histamine challenge, eosinophil cationic protein levels and skin prick tests (all p<0.05).