Evaluation of the score For comparison Appendicitis Inflammatory Response score (AIR) [16] and Alvarado score [15] were calculated for each patient. The scores were compared by ROC analysis, and the area under ROC curve was determined. The score performance was also evaluated in three clinically different subsets of patients, i.e., in patients with low clinical suspicion, in patients with possible appendicitis and in patients with clinically high suspicion of appendicitis according to surgeons at the emergency department. When evaluating the accuracy of the initial decisions of the surgeons, the use of radiological examinations, final diagnosis and the time taken for decision to operate were considered