Fig 10. Trending ability of ΔSV_EIT vs ΔSV_Ref shown by means of four-quadrant plots for the combination of the two features Δσ_L and $\frac{\Delta {\sigma }_{\mathrm{L}}}{{\sigma }_{\mathrm{G}}}$ and (a) a subject-independent calibration for hypothesis (H3) or (b) a subject-specific calibration for hypothesis (H4).

The exclusion zone was set to ±30%.