Multiple research studies have demonstrated that half to two-thirds of those diagnosed with the higher-IQ form of autism previously known as Asperger syndrome also have ADHD. It has also been shown that those on the autism spectrum with symptoms of ADHD tend to have significantly more difficulty with adaptive behavior in school, home and community and tend to benefit from ADHD treatments. Conversely, approximately 18% of a sample of children diagnosed with ADHD also suffered from autistic traits and had more impaired functioning than those with ADHD alone. Additionally, both ADHD and Asperger syndrome are often further complicated by additional disorders involving anxiety, mood, behavior problems and/or specific learning disorders.