We compared INT− and INT+ on CU levels to ascertain that, consistent with previous research, they would show similar levels of CU even though different in levels of internalizing problems. We also compared the groups on environmental risk exposure (prenatal, early and mid-childhood), to establish whether INT− experience less environmental risk than INT+. We then assessed partial correlations (controlling for sex) between OXTR methylation, risk exposure and CU levels separately for each group, to assess whether associations between these variables differ for INT− vs INT+.
