Baseline characteristics of the three treatment groups.

*Probability values are determined using the χ2 test or by analysis of variance as appropriate. The three-way determinations compared the distribution of variables between all three treatment groups and the two-way determinations between the EGb761® and piracetam groups only.概率值将依据实验的适宜条件，通过χ²检验（chi-square test）或方差分析（analysis of variance）计算得出。三向测定用于比较全部三个处理组间的变量分布，而双向测定仅用于对比EGb761®与吡拉西坦（piracetam）两组间的变量分布。