| Secondary |
| Cote |
| 1990 |
| Canada |
| LMW |
| Wood dust or bark |
| Western red cedar |
| Western red cedar workers (Includes cohort reported by Chan-Yeung, 1987) |
| Occupational asthma |
| Transfer to low exposure area, use of respiratory equipment (mean:6.5 years) |
| 48 of 68 eligible subjects (Participation rate: 71%) |
| For 48 subjects, the transfer to a less dusty job and the use of airstream helmet did not prevent deterioration of asthma. However, the use of the twin-cartridge respirator was associated with favorable outcome (p<0.05). |
