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

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]