Figure 2. Bland-Altman plots of (a) central systolic BP (SP) errors and (b) central pulse pressure (PP) errors.

The solid lines indicate the bias error, while the dashed lines indicate the limits-of-agreement. GTF_ARX is an effective, autoregressive exogenous input-based generalized transfer function (GTF), whereas GTF_SphygmoCor is a GTF that mimics the SphygmoCor device. PP amplification is the ratio of radial to central pulse pressure.