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Table 4 Coefficient of determination R2 of the regression model using bioZR, bioZX, and bioZR + X per frequency. R2 is presented as median [25th quartile – 75th quartile]

From: Towards personalized fluid monitoring in haemodialysis patients: thoracic bioimpedance signal shows strong correlation with fluid changes, a cohort study

Frequency (kHz) bioZR bioZX bioZR + X
160 0.805 [0.545–0.929] 0.721 [0.294–0.934] 0.952 [0.848–0.982]
80 0.889 [0.665–0.963] 0.500 [0.123–0.850] 0.961 [0.888–0.991]
40 0.915 [0.717–0.969] 0.312 [0.065–0.713] 0.970 [0.888–0.993]
26 0.928 [0.752–0.972] 0.262 [0.077–0.588] 0.972 [0.884–0.993]
20 0.940 [0.768–0.975] 0.287 [0.096–0.563] 0.977 [0.893–0.993]
16 0.939 [0.798–0.976] 0.287 [0.102–0.594] 0.978 [0.918–0.993]
13 0.942 [0.790–0.979] 0.317 [0.105–0.586] 0.979 [0.922–0.994]
10 0.950 [0.787–0.976] 0.243 [0.117–0.532] 0.976 [0.903–0.993]
8 0.948 [0.801–0.975] 0.321 [0.116–0.554] 0.982 [0.912–0.993]
  1. bioZR resistance; bioZX reactance