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

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

Probability of appendicitis	All patients^a	No imaging^a	CT^a	US^a	MRI^a
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%)

^aNumbers show patients with appendicitis/total amount of patients in each group (%)
AAS, Adult Appendicitis Score

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