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Table 2 Comparison of predictive validity

From: The effectiveness of ultrasonography in verifying the placement of a nasogastric tube in patients with low consciousness at an emergency center

Evaluation method Total (n = 47) Sensitivity (%) Specificity (%) PPV (%) NPV (%)
  correct position (n = 44) incorrect position (n = 3)     
Ultrasound (+) 38 1 86.4 66.7 97.4 25.0
(−) 6 2     
Auscultation (+) 44 2 100.0 33.3 95.7 100.0
(−) 0 1     
pH (+) 31 1 91.2 66.7 96.9 40
measuring* (−) 3 2     
  1. PPV: positive predictive value.
  2. NPV: negative predictive value.
  3. * pH measuring: The contents were not aspirated in 10 patients.