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a: spECG vs scECG. Box plot displaying the four intervals (PR, QRS, QT, QTc) as measured by scECG and spECG (n = 94). ECG = Electrocardiogram, Sc=Standard Calculated, Sp = Smartphone. b: spECG vs scECG. Box plot displaying the frequencies as measured by scECG and spECG (n = 94). BPM = Beats per minute, ECG = Electrocardiogram, Sc=Standard Calculated, Sp = Smartphone.
