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