Researchers surveyed 225 people admitted to a Swiss hospital for two nights following physical injuries from accidents.
They were interviewed two weeks and six months later. Ten were diagnosed with acute stress disorder at two weeks, while eight had post-traumatic stress disorder at six months.
Patients had less stress if they felt less responsible for the accident. Pre-existing mental health conditions did not affect the likelihood of stress occurring.
Psychotherapy and Psychomatics (2008) 77: 111–118