In a study involving 293 adults, just under one-third (32.8%) were found to have an impulse control disorder. Impulse control disorder prevalence is slightly higher in individuals with Parkinson's disease, affecting up to 40% of those with this condition. This is largely due to medication side effects. The number of children with impulse control issues varies depending on the type. For instance, oppositional defiance disorder affects roughly 3.3% of children while the prevalence of conduct disorder is somewhere between 1.5% and 3.4%.