Diesel engine exhaust and lung cancer risks - evaluation of the meta-analysis by Vermeulen et al. 2014.

[ 3 ] (modified) together, the dose–response association in an adjusted regression model with fixed effects is just about significant ( P = 0.03), i.e., less certain than in the original data analysis ( P < 0.000001).

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The risk estimates are not only lower than in Table 1 , but also do not exhibit a positive trend with increasing exposure levels.

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