The results from the GWA analyses and the two replication samples prompted us to examine a single SNP in one additional sample. The third follow-up sample tested for a single SNP consisted of the 1,822 participants of the Erasmus Rucphen Family study in whom the SNP had been genotyped and for whom personality data were available (age: M = 48.0, SD = 14.5; 58% female). Personality was assessed using the NEO-FFI and the SNP was genotyped using Taqman®.
