目的：探讨医学研究中方差分析常用的效应量——标准均数差的计算方法。

AIM: To explore the standardized mean difference, the common effect size for ANOVA in medical research.

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计算各组变异系数、标准差、极差、均数95%可信区间，比较连续3个心动周期与5个心动周期的参数测量值。

The standard deviation, range, variation coefficient, 95% confidence interval were analyzed, the average values of 3 cycles were compared with those of 5 cycles.

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新生儿评价组的标准方法，使用相对危险度(RR)，风险差(RD)和加权均数差(WMD)。

Standard methods of the Neonatal Review Group with use of relative risk (RR), risk difference (rd) and weighted mean difference (WMD).

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