【Purpose】The purpose of this study was to clarify the characteristics of subjects who had been subjected to two or more police's reports based on Article 23 of the Mental Health and Welfare Act in three years, and to consider measures for enabling them to lead a stable life in the community, taking into account perspectives other than mental health care.
 【Method】We analyzed the data of 748 anonymized police's reports (actual number of persons, 668) sent to Kawasaki City Mental Health and Welfare Center between April 1,2015 and March 31,2018. Those reported twice or more (multiple group) and those reported only once (single group) in the 3-year period were compared. This study was approved by the Research Ethics and Conflict of Interest Conference of the Kawasaki City Mental Health and Welfare Center, and the Kawasaki City Information Disclosure Management Council.
 【Result】The actual number of persons and the total number of reports in the multiple group were 63 (9.4%) and 143 (19.1%), respectively. Examinations for the necessity of involuntary admissions by the prefectural governor were performed for 98 (68.5%) of the reports. Comparing the multiple and single groups, a higher percentage of patients in the multiple group had a history of involuntary hospitalization by the prefectural governor (39.7%, χ²=80.206, P< 0.001) compared to the single group. As a result of the examinations, a primary diagnosis was also higher in F5 (Behavioural syndromes associated with physiological disturbances and physical factors, 2.0%), F6 (Disorders of adult personality and behaviour, 16.3%), and F7 (Mental retardation, 8.2%) as coded in the International Classification of Diseases Tenth Revision (ICD-10) (χ²=24.467, P=0.018). On the other hand, there was no statistical difference in the frequency of involuntary admissions by the prefectural governor including those ordered urgently (Article 29-2). In addition, the multiple group presented a higher frequency of "decisions not to perform examination" (χ²=6.902, P=0.032), "no need for hospitalization or medical treatment" (χ²=12.661, P=0.013), and "direct discharge from involuntary hospitalization by the prefectural governor without transferring to another form of admission" (-32.8%, χ²=-9.703, P=0.021), compared to the single group.
 【Discussion】The multiple group had a high proportion of non-psychotic mental disorders and low proportion of hospitalization. As one of the background factors, their behaviors may have an aspect of reaction to an adverse living environment and/or life event. However, the proportions of involuntary hospitalization ordered by prefectural governor, including those ordered urgently, in both groups were almost the same. If we consider the report as a crisis call, it seems to be necessary to have a perspective of community life support corresponding to the subjects' problems of daily life.
 【Conclusion】Although the multiple group had a lower proportion of psychotic disorders than the single group, they also need support. Therefore, it is necessary to consider how to support them from a viewpoint other than psychiatric care.
 Authors' abstract