For temple site Ps, the average absolute error is 6 which is lower than other sites.
The lower standard deviation also signifies that temple site is less error prone compared to others. However, finger site PPG performs better for Pd by a low margin of .65.
Thus, It is evident from the Table 1 that temple region outperforms the other sites in terms of overall accuracy and consistency. For better visualization and understanding we plot % error of different PPG sites of each participants.