Two methods were used to determine PTSD. The first method required that symptom thresholds for DSM-5 Criteria B (n = 1), C (n = 1), D (n = 2), and E (n = 2) be met to a combination of DSM-5 Criterion A event types. Thus, all symptom criteria thresholds must be met, but they could be met in response to any combination of Criterion A event types. This was designated the Composite Event PTSD definition. The second method required Criteria B, C, D, and E symptom thresholds to be met to the same Criterion A event type. Both Composite Event and Same Event PTSD definitions also required the functional impairment criterion to be met, indicating that the PTSD symptoms produced significant distress and/or impairment in functioning. Similar methods were used to determine Composite Event and Same Event PTSD based on the DSM-IV.
