Validation of the Appendicitis Inflammatory Response (AIR) Score.

The AIR score has high sensitivity for complicated appendicitis and identifies subgroups with low probability of complicated appendicitis or high probability of appendicitis. The discriminating capacity is high in children and patients with long duration of symptoms. It performs equally well in both sexes. This verifies the AIR score as a valid decision support. Trial registration number https://clinicaltrials.gov/ct2/show/NCT00971438.