Table 2.

Variables describing potential determinants of exposure

Personal level
Use of compressed air	No, yes
Work shift	Day, evening, night
Machine level
Work task	Sanding, sanding and cutting, cutting, handling and assembling (includes gluing shops for laminated board and veneer), truck driver, foreman, store man)
Level of automation	Fully automatic, semi-automatic, manual
Exhaust ventilation	No, yes, not relevant
Exhaust ventilation, adequate	No, yes, not relevant
Enclosure, partial or full	No, yes, not relevant
Wood dust on the work piece	No, yes, not relevant
Type of wood	Pine, hardwood, composite, medium density fibreboard, mixed wood types
Department level
Natural logarithm of the room volume
Supplementary fresh air intake	No, yes
Heating of supplementary air	No, yes
Cleaning method, rooms	Vacuum cleaning, wet cleaning, compressed air
Daily cleaning of the room	No, yes
Cleaning method, work pieces	Vacuum cleaning, brush, compressed air
Cleaning method, machines	Vacuum cleaning, compressed air
Factory level
Type of factory	Pine furniture, chair factory, kitchen/shop furniture, particle board/medium density fibreboard furniture
Number of employees	<20, 20–199, 200+ employees
Election of a safety representative
Within the last 2 years	No, yes
Re-circulation of air to working rooms	No, yes
Supplementary fresh air intake	No, yes
Re-circulation of air to enclosed machines	No, yes
Plan for regular check of central exhaust ventilation system	No, yes
Plan for cleaning of rooms	No, yes
Special cleaning staff	No, yes