In the case of the rest of the significant variables described in the correlation analyses, they consistently displayed non-significant differences for the COMT genotypes and group interaction, when trait anxiety (span of SST forward (F (2160) = 0.790, p = 0.456) and SST forward score (F (2160) = 1.606, p = 0.204)), depression (LNST score (F (2160) = 1.593, p = 0.207)) or pain were introduced as covariables (span of SST forward (F (2160) = 0.885, p = 0.415)). Here, COMT is linked to major depressive disorder.