A 3 year old comes in after falling 3 feet from the top of a kiddie slide onto cement, hitting his head. His only +PECARN symptom is 2 episodes of vomiting in the 2 hours since the fall. The medical student seeing him states to you that he is PECARN+ and he has discussed CT with the parents. What is the approximate risk of clinically important traumatic brain injury in this patient?
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