ADHD as Kids - Is There a Difference Between Boys and Girls?

About something around 30% of people, depending on how you measure it, who have ADHD as kids do find that these abilities improve. But what they found in and Phil Shaw's study is that among those kids whom they were comparing who had ADHD, on average, they were about three years behind in the development of those parts of the brain. Are there any gender-related differences? Do boys seem to have the challenges more, boys and men, more than girls and women?