Algorithm for patient eligibility and analysis. *Head injuries not including trivial facial injuries defined as a ground level fall or walking or running into an object with no signs or symptoms of injury other than facial abrasions or lacerations below the eyebrows. CT computed tomography. LTFU lost to follow up. CHALICE Children’s Head Injury Algorithm for the Prediction of Important Clinical Events. CATCH Canadian Assessment of Tomography for Childhood Head Injury. PECARN Pediatric Emergency Care Applied Research Network.