To further elucidate the genetic and environmental contributions of each disorder to the phenotype, bivariate analyses were conducted for TS combined with OCD and ADHD, and the RhoE and RhoG, corresponding to the environmental and genetic correlations between the traits, were calculated. As hypothesized, there was a strong genetic correlation between TS and OCD, between OCD and ADHD, and between TS and OCD+ADHD, but not between TS and ADHD (Table 4). Instead, there was a significant environmental correlation between TS and ADHD. Contrary to our expectations, there were no significant genetic or environmental correlation between TS and OCB.
