Just my two cents for what it's worth but....when cortisol levels are low (high 17 OHP), the body is instructed to pump out more testosterone (basically). So, it just makes sense to me that when a child's levels are high, their testosterone is also pumping and we all know that tesosterone equals aggression... my daughter even starts throwing things (an absolute no-no) and is very verbally unkind. I would guess that testosterone acts the same way in boys as it does in girls and when the levels are up, they become more aggressive.