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The PPG waveform feature models that provided added value in predicting BP changes. The b-time and STT, which are PPG fast upstroke time intervals (see Fig. 3 for definitions), reduced the BP change root-mean-squared-error (RMSE) relative to reference models not including PPG waveform features as input by about 10% (see Table I). The superscript i is the ith measurement; i=1, baseline measurement for cuff calibration.
