Fig. 7
Box and whisker plots showing the distribution of ΔtR in the four recumbent positions. The box plot displays the 25th percentile, median, and 75th percentile and the whiskers extend to the minimum and maximum values without outliers. The number of heartbeats (n) is indicated over each box plot. ΔtR: time difference of the onset of the R wave between the ECG and pECG signals (positive value indicates that the onset of the R wave on the pECG signal appeared later than that on the ECG signal).
