The purpose of the current study is to assess the annual trends of accident incidence rate in school and to analyze the factors that explain such trends. The target for analysis was the dataset of the annual report on the Injury and Accident Mutual Aid Benefit System published by the Japan Sport Council. The accident incidence rate of each elementary school activity was calculated using the annual total number of pupils reported by the Ministry of Education, Culture, Sports, Science and Technology. From the results of Cochran-Armitage trend test, many activities showed a trend of decreasing. The five highest decreasing rates were in “camp school”, “seaside school”, “period of integrated study”, “swimming”, and “self-reliance activity”. Remarkably, the activity in most rapidly increasing trend was “moral education”, which were 19.47 times higher than nine years ago. Regard with moral education, accident incidence rates by place, by school grade, and by injury or illness categories were calculated in particular. As the result, the incidence in “lower school grades”, “classrooms”, and “bruises /contusions” showed a comparatively high increase. It is considered that recent trends for qualitative change in moral education may be causing the rapidly increasing trend.
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