Extended Data Fig. 3: Comparison of daily RHR measurements by PHRM and reference and conventional RHR measurements in free-living conditions.
From: Passive heart-rate monitoring during smartphone use in everyday life

a–c, Scatter plots showing the agreement between PHRM-estimated daily RHR values and reference RHR from a Fitbit wearable HR tracker (a), supine RHR measurements from ECG (b) and sitting RHR measurements from ECG (c), respectively.