We also tested for disorder specific transmission effects across siblings, allowing these effects to vary for MZ twins, DZ twins and non-twin biological siblings, and adoptive siblings. Including specific transmission effects across siblings resulted in a lower BIC value for each disorder. The specific effect for adult antisocial behavior, however, was no longer significant when the other disorder specific effects were included in the model; therefore, this effect was dropped. Specific transmission effects for siblings were medium to large for MZ twins (0.32 to 0.58), small to medium for DZ twins and non-twin biological siblings (0.08 to 0.36), and mostly non-significant for adoptive siblings (-0.05 to 0.13). The final best fitting model is depicted in Figure 1.
