Fig. 2

The interquartile ratio (IQR) computed for the parameters of the closed-loop model. The “Single day IQR” which is based on the median IQR values for the estimates for single individuals on any measurement day are included. The whiskers indicate first and third quartiles. The variation in individuals over all measurement days are displayed as “Multiple day IQR”. The final parameter estimates for all individuals in the different data sets yield the “Population IQR”. “F” indicates the data set with finger pressure waveform, and “C” indicates the data set with the carotid pressure waveform. The IQR refers to the difference between the upper and lower quartiles divided by the mean parameter value. \(E_{\text{max}}\) is the maximal left-ventricular elastance, \(C_{\text{ao}}\) is the systemic arterial compliance, \(R_{\text{sys}}\) is the total peripheral resistance, \(t_{\text{peak}}\) is the time of maximal ventricular elastance, \(Z_{\text{ao}}\) is the characteristic aortic impedance, \(V_{\text{tot}}\) is the total stressed blood volume, and \(C_{\text{sv}}\) is the systemic venous compliance