Analysis: For each patient characteristic examined, the investigators will look for a statistically significant difference between those patients who have normal head imaging, and those with abnormal imaging. Using the characteristics that are significantly different, the investigators will develop a clinical decision rule to help providers assess the risk of significant findings in an individual patient. The investigators will also develop a decision tree to help aid providers when deciding which patients need head imaging. A sample of patients will have two independent assessments to allow us to look for evidence of inter‐rater reliability in our questionnaires.