New research suggests predictors of adolescent ADHD and conduct disorder can be identified—and intercepted—in school-age children. According to a recent study, it is crucial to identify and remedy “bad” behavior and low academic performance during kindergarten. If these 2 modifiable factors occur together in a young child and are allowed to persist, the odds that the child will display severe symptoms of comorbid ADHD and conduct disorder are 8 to 1.