Impact factor Amp. Dur. Turns Phases Area Satellite Rate Gender 0.925 0.019 0.395 0.384 0.058 0.887 Age 0.483 0.224 0.186 0.007 0.432 0.769 Parity 0.336 0.002 0.271 0.129 0.881 0.014

Table 2: P values of multiple linear regression analysis presenting the effect of age, gender, and vaginaldelivery experience on EMG parameters; Amp., amplitude; Dur., duration. Significant P values (<0.05) are in bold print.