Episode 39 of CRAMSURG - Clinical Reasearch Appraisal and Methodology for Surgical Trainees. The paper for discussion is Diagnostic Accuracy of Unenhanced Computed Tomography for Evaluation of Acute Abdominal Pain in the Emergency Department JAMAsurg May 2023. The teaching topic is Statistical Tests part 1 - Chi-square. Brought to you by CRAMSURG www.cramsurg.org.