Fig. 1

Diagnosis of ADHD in patients who visited our specialty outpatient clinic for dementia. A total of 446 patients visiting our specialty outpatient clinic for dementia were evaluated by neuropsychiatric specialists. After ruling out 39 patients with psychiatric diseases or organic diseases, 81 fulfilled our criteria and 326 did not. Developmental disorder specialists examined and reviewed the medical records for these 81 patients. As a result, 9 patients were suspected of having ADHD, and 7 of these 9 patients were given a diagnosis of ADHD. In terms of EOAD, neuropsychiatric specialists suspected 37 patients of having EOAD at the first examination. Of those 37 patients, 22 patients (3 who fulfilled our criteria and 19 who did not) were diagnosed with EOAD and 6 patients were diagnosed with ADHD. The remaining 9 patients were diagnosed with the other diseases. From the point of view of ADHD, ADHD accounted for 1.6% of patients who initially visited our specialty outpatient clinic for dementia and accounted for 16% of patients initially suspected of having EOAD