Moreover , significant differences in the change values of map size ( @ -LSB- @ -RSB- for the experimental group vs. -@ -LSB- @ -RSB- for the control group , P = @ ) and mean ( SD ) motor evoked potentials ( @ -LSB- @ -RSB- mV for the experimental group vs. -@ -LSB- @ -RSB- mV for the control group , P = @ ) were found .