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Table 2 Diagnostic performance of abdominal ultrasonography and abdominal radiography for the diagnosis of pneumoperitoneum based on senior revision

From: Accuracy of abdominal ultrasound for the diagnosis of pneumoperitoneum in patients with acute abdominal pain: a pilot study

  Sensitivity (95 % CI) Specificity (95 % CI) PPV (95 % CI) NPV (95 % CI) +LR (95 % CI) −LR (95 % CI)
US exama 95.5 (86.3–99.2) 81.8 (72.6–85.5) 84.0 (75.9–87.3) 94.7 (84.1–99.0) 5.25 (3.15–6.85) 0.05 (0.01–0.18)
2 scan-fast USb 93.2 (83.6–98.1) 81.8 (72.3–86.7) 83.7 (75.1–88.1) 92.3 (81.5–97.8) 5.12 (3.01–7.38) 0.08 (0.02–0.22)
X-rayc 72.2 (54.8–85.7) 92.5 (79.5–98.3) 89.6 (72.6–97.6) 78.7 (64.3–89.2) 9.63 (3.18–29.13) 0.30 (0.18–0.51)
  1. US ultrasound, PPV positive predictive value, NPV negative predictive value, +LR positive likelihood ratio, −LR negative likelihood ratio, 95 % CI confidence interval
  2. aOne scan positive among those obtained with convex or linear probe
  3. bOne scan positive among right hypochondrium and epigastrium scans with convex probe
  4. cConsidering 19 patients with available abdominal radiography