Figure 6.

Single-peak PPG waveform analysis results. (A) Distribution diagram of the comparison between the estimated diastolic blood pressure and the actual blood pressure, which is approximately ideal. (B) Bland-Altman diagram of the diastolic blood pressure, most of which is concentrated at approximately 7 mmHg. (C) Estimated systolic blood pressure and actual blood pressure. Because the test data are the data of critically ill ICU patients, the second wave peak is challenging to evaluate, resulting in a considerably overdispersed result. (D) The Bland–Altman chart of systolic blood pressure has an excessively large error in the estimation results.