[Purpose] We aimed to compare the prevalence of Adverse Childhood Experiences (ACEs) and Potentially Traumatic Events (PTEs) among outpatients at general psychiatric clinics with those of the general population in Japan. We also examined the proportion of the PTSD high-risk group in patients with PTEs. [Methods] This study used the secondary data analysis of medical records from two psychiatric clinics, which agreed to provide them. The study subjects were patients over 18 years old (N=1058) who visited the clinics and agreed to provide their medical records for the study purpose during a month in 201X. The response rate was 96% (1011 of 1058). Of 1011, we analyzed 1008 patients who have been diagnosed with mental disorders based on the ICD-10 criteria. We obtained several types of data: sex, age, clinical diagnosis, ACEs, Life Events Checklist for DSM-5, Impact of Event Scale-Revised. [Results] In total, 61% had at least one ACE, and 88% had at least one PTE, which were significantly higher than those of the general population. In addition, more than half of the patients with PTEs were in the PTSD high-risk group. [Discussion] As far as we know, this is the first study, which showed the high prevalence of ACEs and PTEs among patients at general psychiatric clinics in Japan. Furthermore, more than half of the patients with PTEs had current PTSD symptoms. Clinicians need to pay more attention to ACEs and PTEs for better treatment and care, although we should be cautious of generalizing our results because of the convenience sampling.
 Authors' abstract