Twelve OXTR SNPs, evenly distributed over the gene and previously proposed to be associated with autism and other aspects of social behaviors (Table 1), were genotyped in the adult men and women from the Twin and Offspring Study in Sweden (TOSS, N=2309) (50) and in the participants of the Swedish Twin Study of CHild and Adolescent Development (TCHAD, N=1240) sample (53). The allele and genotype distributions of the studied SNPs were similar to what has been reported in previous studies and did not deviate from Hardy-Weinberg equilibrium.
