Girls with attention-deficit/hyperactivity disorder were much more likely to have both internalizing and externalizing disorders than girls without ADHD...Investigators performed a meta-analysis to assess rates of anxiety, depression, oppositional defiant disorder, and conduct disorder among girls with and without ADHD. The analysis included 18 studies involving almost 2000 girls (77% white; mean age range, 8.5–13.5 years).