同时使用卡方分析比较分类变量。
Simultaneously, categorical variables were compared with use of chi-square analysis.
对结果进行卡方分析。
必须重视对卡方分析结果的解释，因为当试验只有很小的样本量或者数量极小时，通常情况下Meta分析具有较低的把握度。
Care must be taken in the interpretation of the chi-squared test, since it has low power in the (common) situation of a meta-analysis when trials have small sample size or are few in number.
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