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Analysis of simplified design. In order to test the hypothesis that cathode phase duration alone determined threshold levels, the cathode phase was fixed at 123 μs and the asymmetry and phase order were varied. The cathode leading, symmetric pulse was designated as control and Dunnett’s method for multiple comparisons of main effect to control was used (α = 0.05). The symmetric anode leading waveform showed the only significant difference from control (p < 0.0001).
