The Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) defines traumatic occurrences as including "actual or impending death or significant harm, or a danger to the bodily integrity of self or others," and the person's reaction at the time involves "fear, helplessness, or terror" (or disorganized or agitated behavior in children). The second component of the definition is intended to be omitted in the DSM-V since it has limited value for adults or children. Recent epidemiological research in the United States has demonstrated that teenagers are frequently exposed to a variety of traumatic experiences classified in this manner. The population incidence of Post Traumatic Stress Disorder (PTSD) is, nevertheless, modest, at around 5%.
