Individuals with autism commonly have ADHD symptoms. A recent study involving 519 children taking stimulants and 289 without stimulants were followed into adulthood. (James M. Swanson, L. Eugene Arnold, Brooke S. G. Molina, Margaret H. Sibley, Lily T. Hechtman, Stephen P. Hinshaw, Howard B. Abikoff et al., "Young Adult Outcomes in the Follow-up of the Multimodal Treatment Study of Attention-Deficit/Hyperactivity Disorder: Symptom Persistence, Source Discrepancy and Height Suppression," Journal of Child Psychiatry and Psychology, (March 10, 2017): doi: 10.1111/jcpp.12684). Long term use of stimulant medication was associated with a reduction in adult height, yet no reduction in ADHD symptoms.