a nonsignificant trendp = 0.08
Those individuals who were homozygous for the low-activity COMT enzyme allele ( Met/Met ) had lower scores on the extraversion personality dimension than those participants with the high-enzyme genotype ( Val/Val ) (F(1,253) = 5.10, p < 0.05); there was a nonsignificant trend for individuals with the low-activity genotype to have higher neuroticism (F(1,252) = 0.10, p = 0.08).