The result of the pilot study to determine subgroup to be used in the study (N = 225).

*Used in this study.**Data on known population size are from Fire and Disaster Management Agency; National Police Agency; Ministry of Internal Affairs and Communication; Ministry of Defense; and Ministry of Health, Labour and Welfare.

*本研究采用的数据集。* 已知人口规模相关数据来源于消防厅（Fire and Disaster Management Agency）、警察厅（National Police Agency）、总务省（Ministry of Internal Affairs and Communication）、防卫省（Ministry of Defense）以及厚生劳动省（Ministry of Health, Labour and Welfare）。