Table 1 Characteristics of participants in the study.

Fisher’s exact test was used to test whether the distribution of individuals randomized to the treatment conditions differed by sex and by ethnicity; no significant effects were found. For age, IQ, pretreatment SRS-2 T score, pretreatment CGI-S score, pretreatment blood AVP concentration (in picograms per milliliter), and pretreatment blood AVPR1A:OXTR gene expression, differences between treatment conditions were tested with a simple one-way general linear model; no significant effects were discerned. The values are reported as means ± SE. F, female; M, male; IQ, Intelligence Quotient; SRS-2, Social Responsiveness Scale, 2nd Edition; CGI-S, Clinical Global Impression-Severity; AVP, arginine vasopressin AVPR1A:OXTR, relative gene expression as the ΔΔC_t of AVPR1A and OXTR gene expression.