risk factor on the 1st principal component among the 6 environmental variables, and examined whether the residual variance continued to moderate the ACE effects on EXT. While the common variance across the environmental variables accounted for a large portion of the moderation effects, the residual variance of each environmental variable continued to exert significant moderating effects on EXT, χ2(6) = 28.6 to 195.2, all p's < .001.
