Clinical Study
Prevalence of Occupational Asthma and Respiratory Symptoms in Foundry Workers
Table 2
The number of workers with occupational asthma and airway obstruction (based on FEV1).
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OA: occupational asthma; the airway obstruction was classified according to forced expiratory volume in one second (FEV1, % of predicted) results and divided into 3 groups as mild (>79%), moderate (60–79%), and severe (40–59%). P = 0.001 compared to non-production department. |