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Table 3 Diagnostic performance of US and CT

From: Performance of imaging studies in patients with suspected appendicitis after stratification with adult appendicitis score

Probability of appendicitis according to AAS Sensitivity Specificity LR+ LR- DOR
US
 All patients 48.6% 94.4% 8.646 0.545 15.86
 High (AAS ≥16) 46.3% 90.9% 5.098 0.590 8.636
 Intermediate (AAS 11–15) 48.4% 95.6% 10.971 0.540 20.291
 Low (AAS ≤10) 47.1% 93.5% 7.274 0.566 12.848
CT
 All patients 98.4% 92.2% 12.615 0.017 742.06
 High (AAS ≥16) 100.0% 95.8% 23.98 0 Infinite
 Intermediate (AAS 11–15) 97.8% 90.6% 10.385 0.024 432.69
 Low (AAS ≤10) 93.8% 94.0% 15.573 0.067 234.00
  1. AAS, Adult Appendicitis Score, LR+, positive likelihood ratio, LR, negative likelihood ratio, DOR diagnostic odds ratio