Effectiveness of a worksite intervention to reduce an occupational exposure: the Minnesota wood dust study.
OBJECTIVE
This study assessed the effectiveness of an intervention to reduce wood dust, a carcinogen, by approximately 26% in small woodworking businesses.


METHODS
We randomized 48 businesses to an intervention (written recommendations, technical assistance, and worker training) or comparison (written recommendations alone) condition. Changes from baseline in dust concentration, dust control methods, and worker behavior were compared between the groups 1 year later.


RESULTS
At follow-up, workers in intervention relative to comparison businesses reported greater awareness, increases in stage of readiness, and behavioral changes consistent with dust control. The median dust concentration change in the intervention group from baseline to follow-up was 10.4% (95% confidence interval = -28.8%, 12.7%) lower than the change in comparison businesses.


CONCLUSIONS
We attribute the smaller-than-expected reduction in wood dust to the challenge of conducting rigorous intervention effectiveness research in occupational settings.
Division of Epidemiology, University of Minnesota, Minneapolis, Minneapolis, MN 55454, USA. lazovich@epi.umn.edu
DeAnn
D
Lazovich
David L
DL
Parker
Lisa M
LM
Brosseau
F Thomas
FT
Milton
Siobhan K
SK
Dugan
Wei
W
Pan
Lynette
L
Hock
D000328:Adult; D000395:Air Pollutants, Occupational / Q000032:analysis*; D004391:Dust / Q000009:adverse effects / Q000517:prevention & control*; D004784:Environmental Monitoring; D017408:Guidelines as Topic; D006801:Humans; D007221:Industry / Q000592:standards*; D019570:Inhalation Exposure / Q000032:analysis / Q000517:prevention & control*; D007318:Inservice Training; D008452:Maximum Allowable Concentration; D008875:Middle Aged; D008910:Minnesota; D016273:Occupational Exposure / Q000032:analysis / Q000517:prevention & control*; D010865:Pilot Projects; D015397:Program Evaluation; D011897:Random Allocation; D011795:Surveys and Questionnaires; D014691:Ventilation; D014934:Wood
D000395:Air Pollutants, Occupational; D004391:Dust