The researchers also met with the children every year to assess levels of behavioral problems in a face-to-face setting.

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As for Williams, who has lost so many including her young cousin, she is working with children with behavioral problems to teach them to understand consequences of violence before it is too late.

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Here's the bad news: As a group, children with ADHD don't do as well in school and have more behavioral and emotional problems through the years than do children without ADHD regardless of how much treatment they get.

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African-Americans, girls, and adolescents with behavioral problems had a higher likelihood of getting pregnant or impregnating someone, as did youths who intend to have children early, the study showed.

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