|Molecular Weight of Agent||LMW|
|Occupation|| Aluminum smelters|
|Outcome/Diagnosis||Occupational Asthma (OA)|
|Activity Intervention|| Exposure Control, respiratory protection, and pre-placement medical assessments.|
|Participation Rate||All smelters participated in the study throughout the study period.|
- The incidence of OA was highest in 1992 at 9.46/1,000/year declining to 0.36/1,000/year in 2006
- The incidence of OA was significantly correlated with geometric mean total fluoride concentration(r(s)=0.497, P<0.00.