Figure 7:The mean EF values estimation of all ECG leads for 50 subjects by employing trapezoidal, Simpson, and Boole’s method and true value reported by cardiologist. A: all leads B:leads V1-V4, C:II,III,aVF, D:I,aVL,V5-V6, E:II,aVF,V2, F: The Boole’s results of all groups.