Table 1– Mutually exclusive exposure categories
CategorySubjects nDescription
Grace worker255“No” to any traditional asbestos occupations, but “yes” to ever worked for W.R. Grace & Co./Zonolite
Other vermiculite occupation664“No” to any traditional asbestos occupations, a non-W.R. Grace & Co./Zonolite worker, “no” to household, but “yes” to living with W.R. Grace & Co./Zonolite worker, and “yes” to either of the following: “ever worked as a secondary contractor to the mining or processing facilities” (e.g. as a lorry driver, delivery person, caretaker, etc.); or ever had jobs in which you may have been exposed to vermiculite (e.g. insulation installer, logger near the mine, etc.)
Other dusty occupation831“No” to any traditional asbestos, a non-W.R. Grace & Co./Zonolite worker, “no” to household, “no” to other vermiculite occupations, but “yes” to any of the following (hereafter called other dusty occupations): any dust exposure at other jobs, or worked as a plumber, plasterer, carpenter, roofer, electrician or welder, or worked in a shipyard, in ship construction or repair, in the military, or on any kind of ship
Household with other vermiculite occupation114“No” to any traditional asbestos occupations, and a non-W.R. Grace & Co./Zonolite worker, but “yes” to living with W.R. Grace & Co./Zonolite worker, and “yes” to other vermiculite occupations
Household with other dusty occupation172“Yes” to household, “no” to any traditional asbestos occupations, a non-W.R. Grace & Co./Zonolite worker, “no” to other vermiculite occupations, but “yes” to other dusty occupations
Household without dusty occupation594“Yes” to household, “no” to any traditional asbestos occupations, a non-W.R. Grace & Co./Zonolite worker, and “no” to other vermiculite occupations or other dusty occupations
Environmental1894“No” to any traditional asbestos, a non-W.R. Grace & Co./Zonolite worker, and “no” to household, other vermiculite occupations and other dusty occupations