Table 2

Description of 19 cases of asthma presumed to be induced by TDI

Variables of subjects and exposureOnset of symptoms
Before 1980On or after 1980
Job category:
 Field operator65
 Maintenance or technician32
 TDI loading20
Cigarette smoking status
 Current (<1 pack/day)10
 Current (⩾1 pack/day)03
Basis for case ascertainment:
 History of symptoms103
 History of symptoms+pulmonologist evaluation12
 History of symptoms+shift in PFTs before to after03
Earlier exposure to TDI or phosgene:
 Phosgene and TDI21
Duration of earlier TDI exposure (months):
Duration of exposure after onset of symptoms (y):