highly significantp < 0.0001
Whereas there was no statistically significant sex difference for AChE-R, the difference for AChE-S was highly significant: p < 0.0001 for the main effect of sex and p < 0.0001 for the interaction of sex × region, with the main effect of sex significant both for brainstem ( p < 0.004) and forebrain ( p < 0.0001).