Number of phase reversals for each bipolar contact, LL-SSEP component and stimulation side (ipsi- and contralateral).

No significant difference was found in the number of phase reversals between bipolar contacts according to the Wilcoxon signed-rank test (p = 0.157 for ((0 vs. 1) vs. (1 vs. 2)), p = 0.395 for ((1 vs. 2) vs. (2 vs. 3)), p = 1.0 for ((0 vs. 1) vs. (2 vs. 3))).

根据威尔科克森符号秩检验（Wilcoxon signed-rank test），双极触点（bipolar contacts）间的相位反转次数（phase reversals）未发现显著差异；其中针对((0 vs. 1)与(1 vs. 2))的检验p值为0.157，针对((1 vs. 2)与(2 vs. 3))的检验p值为0.395，针对((0 vs. 1)与(2 vs. 3))的检验p值为1.0。