Finally, the exposed members of the same-sex discordant pairs (N=89) were compared with unrelated but sex-matched unexposed individuals. Significantly lower volumes for the left amygdala (~5.1%) were observed for the exposed vs. unexposed members of these unrelated pairs (eTable 13). This confirmed that the lack of volumetric differences between exposed and unexposed members of discordant pairs (Contrast 1) was attributable to familial matching and not a reduced sample size.
