From: CYP1A1 methylation mediates the effect of smoking and occupational polycyclic aromatic hydrocarbons co-exposure on oxidative DNA damage among Chinese coke-oven workers
Co-exposure
Total effect
Direct effect
Proportion mediated by CYP1A1 hypomethylation
P value
Smoking and1-OHP
1.03 (1.00–1.06)
1.02 (1.00–1.05)
13.6% (2.6–47.9%)
0.047