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Table 2 Outcomes of CT and US cohorts

From: An international evaluation of ultrasound vs. computed tomography in the diagnosis of appendicitis

Outcome CT cohort (N= 79) US cohort (N= 197)  
Sensitivity    
   %, ± 95% CI 100% (94.2-100%) 68.4% (60.9-75.0%)  
PPV    
   %, ± 95% CI 100% (94.2-100%) 94.5% (88.6-97.6%)  
Neg appendectomy (after positive imaging) 0% (0 of 78) 5.5% (7 of 128) p = 0.049
Times (min)    
   Admission to imaging ordered    
Mean (95% CI) 142.6 (122.6-162.6) 158.4 (139.3-177.5) p = 0.870
Median (IQR) 130.0 (74.0-198.0) 114.0 (74.5-193.5)  
   Imaging ordered to complete    
Mean (95% CI) 194.2 (177.9-210.5) 38.2 (31.1-45.3) p < 0.001
Median (IQR) 184.0 (147.0-228.0) 20.0 (7.0-49.0)  
   Imaging complete to ED disposition    
Mean (95% CI) 222.7 (187.5-257.8) 251.7 (221.2-282.3) p = 0.891
Median (IQR) 192 (141.0-266.0) 193.0 (101.0-312.5)  
   Admission to ED disposition
Mean (95% CI) 559.5 (518.6-600.4) 448.3 (410.9-485.7) p < 0.001
Median (IQR) 533.0 (450.0-632.0) 387.0 (259.0-571.5)  
  1. *Means were compared with two-tailed t-test. Negative appendectomy rate was compared with two-tailed Fisher's exact test.