Statistical analysis
Repeated‐measures two‐way ANOVAs were performed to determine the effect of group (test group, control group vs. placebo group) and condition (pretreatment vs. posttreatment) on GCS score, CRS‐R total scores and subscores, EEG reactivity, and SSEPs. Bonferroni post hoc correction was used to check for significant comparisons (significance level α of 0.05). A priori comparisons were made as specified. Normal distribution was tested by the Shapiro–Wilk test (all 