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Table 2 Prevalence of appendicitis in patients that underwent either no diagnostic imaging, US, CT or MRI

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

Probability of appendicitis All patientsa No imaginga CTa USa MRIa
All patients 724/1545 (46.9%) 356/723 (49.2%) 257/489 (52.6%) 177/497 (35.6%) 5/14 (35.7%)
High (AAS ≥16) 386/439 (87.9%) 261/282 (92.6%) 90/114 (78.9%) 41/52 (78.8%) 1/2 (50%)
Intermediate (AAS 11–15) 304/596 (51.0%) 89/172 (51.7%) 138/276 (50.0%) 122/258 (47.3%) 2/8 (25%)
Low (AAS ≤10) 34/510 (6.7%) 6/269 (2.2%) 16/99 (16.2%) 17/187 (9.1%) 2/4 (50%)
  1. aNumbers show patients with appendicitis/total amount of patients in each group (%)
  2. AAS, Adult Appendicitis Score