Conclusion
In conclusion, we did not find a clear association between
occupational exposure to wood dust and lung cancer,
when all wood-exposed workers were grouped together.
When restricting to those exposed to wood dust at a substantial
level, we found an increased risk in two of three
subsets of the data. These results provide evidence in favor
of the hypothesis of an association between substantial
exposure to wood dust and lung cancer. Given the high
prevalence of exposure to wood dust, these results are
important.