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Table 3 Sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) for z-score cutoffs of −2 for muscle thickness and +2 for echo intensity

From: Diagnostic accuracy of quantitative neuromuscular ultrasound for the diagnosis of intensive care unit-acquired weakness: a cross-sectional observational study

  Cutoff Sensitivity (%) Specificity (%) PPV (%) NPV (%)
BB thickness Z-score < −2 3 97 50 43
FCR thickness Z-score < −2 27 83 67 48
RF thickness Z-score < −2 3 97 50 43
TA thickness Z-score < −2 8 93 60 43
BB echo intensity Z-score > 2 36 67 58 44
FCR echo intensity Z-score > 2 46 73 68 52
RF echo intensity Z-score > 2 36 67 58 44
TA echo intensity Z-score > 2 38 80 71 49
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