OGG1 and Hearing impairment: This suggests a disadvantageous role of the hOGG1 mut and het variants, as regards the risk of hearing impairment due to the exposure to VOCs, as also confirmed by the multivariate linear regressions using the hOGG1 polymorphism as a two-level factor, as shown in the last column of Table 2 for miR-497_5p and miR-206, both correlated, in this case, with the DPOAE level.