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

Annals of Intensive Care

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

	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