Impact of events scale
The Impact of events scale is a 22 item questionnaire.
Items are scored on a 0-4 scale, with the total scale score calculated as a sum of the factor scores.
Creamer, M. Bell, R. & Falilla, S. (2002). Psychometric properties of the Impact of Event ScaleRevised. Behaviour Research and Therapy. 41: 1489-1496.