Compared to the new score, AIR-Score classified only a small minority of patients (8.4%) into high probability category, and therefore the need of diagnostic imaging, consultations, and further observation (or the rate of negative appendectomies) remains the same as without scoring. Alvarado-score classifies nearly half of all patients into the high probability category. In this category, however, diagnostic accuracy of the Alvarado-score reaches neither the accuracy of overall clinical diagnostics nor the accuracy of the new score. In the original publication of the AIR-score, the AIR-score performed better than in our study population. The reason for this could be in different age distribution or otherwise different inclusion criteria of patients.