BOHRF Original Authors' Main Conclusions
The original authors' main conclusions are taken from Abstract, Results and
Discussion. They are decided upon by the authors of the BOHRF occupational
asthma guidelines and form part of the guidelines.
Retrospective study of 609 claims submitted to Ontario Workers Compensation Board (WCB, 1984-1988). Study to assess determinants of outcome of WCB accepted claims at permanent disability assessments. The WCB decision reached was occupational asthma in 39% of claims (57% of these attributed to isocyanates). A further 39% were accepted for aggravation of asthma from irritant exposures (AA). Exposure to a known sensitiser occurred in 91% with occupational asthma and to an irritant in 67% with AA. Of 200 occupational asthma accepted claims reviewed at a mean of 1.9 years later, clearing of asthma occurred in 19% and milder asthma in 47%. At follow-up 54% were unemployed. Outcome was best with early diagnosis and milder impairment of pulmonary function at initial assessment.
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