You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which of the following factors is the most impoant predictor of development of Post-Traumatic Stress Disorder (PTSD) in a 30-year-old man who has just been involved in a road traffic accident? and explain in detail?
Severity of event or accident is the most impoant predictor for development of PTSD.