However, the small number (n = 5) of machining workers who provided samples for comet assay presented a very low level of U-Cr and this possibly biased the exposure level of this subgroup that did not reach statistical significance over the controls ( p = 0.090).
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HBM4EU Chromates Study-Genotoxicity and Oxidative Stress Biomarkers in Workers Exposed to Hexavalent Chromium.
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The sentences
Comparison of pre-shift and post-shift MDA and 8-OHdG levels showed a trend for higher levels of both biomarkers in the pre-shift samples, although significant differences between the pre- and post-shift samples were only reached for 8-OHdG levels ( p = 0.002).