| R | Pearson’s correlation coefficient |
| MAE | mean absolute error (systolic or diastolic) |
| MB | mean bias (calculated using Bland–Altman method) |
| PPG | Photoplethysmogram signal |
| APG ABP |
acceleration PPG automated blood pressure measurement |
| RMSE | root mean square error (systolic or diastolic) |
| PE | precision error (systolic or diastolic) |
| Ra | correlation coefficient between PPG feature with measured BP |
| Rb | correlation coefficient between estimated BP and measured BP |
| N/R | not reported |
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