To further examine the impact of the rs2653349 SNP on individual differences in the vulnerability to develop other psychiatric diseases in healthy subjects, we examined the possible effect of the rs2653349 genotype in the HCRTR2 gene on total Schizotypal Personality Questionnaire (SPQ) scores [25–27] using a one-way analysis of covariance (ANCOVA). Here, HCRTR2 is linked to psychiatric disorder.