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Table 3 Accuracy of BIA in reference to DXA in identifying patients with reduced muscle mass (a) and sarcopenia (b)

From: Case finding for sarcopenia in geriatric inpatients: performance of bioimpedance analysis in comparison to dual X-ray absorptiometry

a Patients with reduced muscle mass (n = 60, before functional prescreening)
  True pos. (n) False pos. (n) false neg. (n) True neg. (n) PPV NPV Sens. Spec. Acc.
DXA 18 - - 42      
BIA (threshold Janssen et al.) 14 12 4 30 54 % 88 % 77 % 71 % 73 %
BIA (threshold Chien et al.) 10 4 8 38 71 % 83 % 55 % 90 % 80 %
b Patients with sarcopenia (n = 38, after functional prescreening)
  True pos. (n) False pos. (n) False neg. (n) True neg (n) PPV NPV Sens. Spec. Acc.
DXA 13 - - 25      
BIA (threshold Janssen et al.) 12 7 1 18 63 % 94 % 92 % 72 % 79 %
BIA (threshold Chien et al.) 9 2 4 23 82 % 85 % 69 % 92 % 84 %
  1. PPV positive predictive value, NPV negative predictive value, Sens sensitivity, Spec specificity, Acc accuracy