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. 2019 Jul 23;9:10666. doi: 10.1038/s41598-019-46936-9

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Correlation (left) and Bland-Altman (right) plots for reference blood pressure (BP) versus BP calibrated from scale pulse transit time (PTT) PTT_S2, wrist PTT PTT_W2, and pulse arrival time (PAT) based on green photoplethysmogram (PPG) in all participants. (a) Diastolic BP (DP). (b) Systolic BP (SP). r: correlation coefficient. RMSE: root-mean-squared error. MAE: mean absolute error. LoA: limits of agreement. R1, R2, R3, R4, R5: rest states. CP: cold pressor. MA: mental arithmetic. SB: slow breathing. BH: breath holding.