Fig. 2

Correlation among the measured hematocrit (HCTm), synthetic hematocrit (HCTsyn), measured extracellular volume fraction (ECVm), synthetic extracellular volume (ECVsyn) in the derivation group. There was modest correlation between the HCTsyn and HCTm (a) and strong correlation between the ECVsyn and ECVm (d). Bland-Altman analysis indicated minimal bias between the HCTsyn and HCTm (b) and between the ECVsyn and ECVm (e). HCTm strongly correlated with (HCTsyn –HCTm) (c) and the ECVm poorly correlated with (ECVsyn – ECVm) (f). HCTsyn was not associated with (HCTsyn –HCTm) in the derivation group (R² < 0.01, p > 0.999) and validation group (R² < 0.01, p = 0.731)