Aim: To explore the characteristics of unintentional injury and relationship between unintentional injury and sense of security among middle school students. Methods: Data were collected by questionnaires. A total of 936 students from a middle school of Zhoukou city participated the study by convenience sampling method. Statistical analysis of the general characteristics,unintentional injury,and sense of security was performed. Results: The annual incidence of unintentional injuries was 22. 3%,and the incid...