Table 4.
RMSE, MAE, absolute bias and relative bias of estimated cortical volume in the validation group (N = 27).
| Equation | RMSE, cm3 | MAE, cm3 | Absolute bias, cm3 | Relative bias, % |
|---|---|---|---|---|
| Eq. 0 | 7.22 | 6.09 | −0.28 | −0.77 |
| Eq. 1 | 8.61 | 7.17 | −0.76 | −1.23 |
| Eq. 2 | 8.33 | 7.05 | −1.83 | −2.44 |
| Eq. 3 | 8.14 | 6.65 | −0.37 | −0.78 |
| Eq. 4 | 7.65 | 6.37 | −1.31 | −1.78 |
Footnote: (i) Eq. 0, estimated CV (cm3) = −1.3 (intercept) + 0.71 × PV (cm3);
(ii) Eq. 1, estimated CV (cm3) = −17.1 (intercept) + 0.15 × eGFR (mL/min/1.73 m2) + 0.076 × body height (cm) + 0.67 × PV(cm3);
(iii) Eq. 2, estimated CV (cm3) = 35.4 (intercept) − 0.2 × age (year) + 4.77 (if male) − 13.2 × log[Cr (mg/dL)] − 0.14 × body height (cm) + 0.67 × PV(cm3);
(iv) Eq. 3, estimated CV (cm3) = −15.5 (intercept) + 0.17 × eGFR (mL/min/1.73 m2) + 0.25 × body weight (kg) + 0.62 × PV (cm3);
(v) Eq. 4: estimated CV (cm3) = 0.4 (intercept) − 0.12 × age (year) + 1.29 (if male) − 15.8 × log[Cr (mg/dL)] + 0.23 × body weight (kg) + 0.63 × PV (cm3).
Abbreviations: CI, confidence interval; MAE, mean absolute error; RMSE, root mean squared error.