| Primary |
| Bernstein |
| 1993 |
| USA |
| LMW |
| Diisocyanates |
| Diphenylmethane diisocyanate (MDI) |
| Workers in a urethane mold plant |
| Occupational asthma |
| Plant design leading to reduction of exposure to MDI |
| 243 of 243 eligible subjects (Participation rate: 100%) |
| Strict control and monitoring of ambient MDI exposure was associated with low prevalence of OA (3 of 243 subjects, 1.2%), which is less than the prevalence of 5% estimated in another plant with workers exposed to MDI. |
