failed to reach significancep = 0.15
In our data and using the same methodological approach to assess volumes, the hippocampal volume of poor CYP2C19 metabolizers was 2.5% larger than in the rest of the sample after adjusting for total subcortical volume, age, sex, and scanning site, but this effect failed to reach significance ( t 601 = 1.04, p = 0.15, one-tailed, Fig. 1 ).