Outgrowing bad behavior?

A couple recent studies appear to show that bad behavior in the early grades of school are likely caused by delayed development issues instead of brain deficity issues. In other words, kids do typically outgrow this bad behavior in school, so test results showing attention problems at young ages are not very well correlated with poor academic performance later in life.

On the other hand, what does appear to be correlated with academic performance later in life is math scores!

http://www.nytimes.com/2007/11/13/health/13kids.html?em&ex=1195102800&en=10574fa94fad2575&ei=5087%0A