Primary |
Grammer |
2002 |
USA |
LMW |
Anhydrides |
Hexahydro-phthalic anhydride (HHPA) |
Workers manufacturing HHPA |
Occupational asthma |
Use of respiratory equipment (1993, 3 types: dust mask, half-face organic vapor respirator, full-face organic vapor respirator) |
Study population was composed of 66 newly hired individuals |
Annual rates of OA for employees employed after 1992 was 0% in 1993 and 1994, 2.0% in 1995, 1.7% in 1996, 1.6% in 1997, and 0% in 1998 and 1999. At the study's initiation, approximately 5% of employees had OA. Statistically, use of one respirator was not superior to the others. |