Fig. 2
Comparison of time courses of relative tissue concentrations of hemoglobin, water, and tissue oxygen saturation between oliguric and non-oliguric patients. The relative tissue concentrations of A oxy-hemoglobin ([HbO2]), B deoxy-hemoglobin ([HbR]), C total hemoglobin [HbT]), and D H2O ([H2O]), and E tissue Hb oxygen saturation (StO2) measured from days 1 to 3 of the study in oliguric and non-oliguric patients are shown. Error bars represent standard deviation of the mean. Relative tissue concentrations of substances in arbitrary units (a.u.). * Generalized estimating equation (GEE) analysis showed a significant difference between the two groups (p ≤ 0.001). # GEE analysis showed that the parameters of oliguric patients changed significantly over time (p < 0.05). The actual p values are included in the Additional file 1