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Subgroup analyses of TiO2-NPs genotoxicity on in vitro T DNA% (a) and OTM (b). ’n’ is the sample size; ’SMD’ is the standardized mean difference; ’95%CI’ is the 95% confidence interval; and ‘p value’ represents heterogeneity between subgroups. Significant heterogeneity between subgroups is at p < 0.05.
