使用中位数和四分位数估计样本中位数和标准偏差与日志正常分布:评估麻醉学元分析初级和二级终点的报告要求
Pei-Fu Chen1,2, Franklin Dexter3
1Department of Anesthesiology, Far Eastern Memorial Hospital, New Taipei City, Taiwan.
概括
在麻醉学元分析中估计四分位数的平均值和标准偏差是不可靠的,因为方法的可信度间隔低于95%. 这影响了P值,需要对偏差数据进行修订报告标准.
科学领域:
- 医学统计 医学统计
- 麻醉学研究 麻醉学研究
背景情况:
- 临床试验经常报告中位数和四分位数,因为数据分布偏差.
- 麻醉学中的元分析通常需要从这些总结统计数据中估计平均值和标准偏差 (SD).
研究的目的:
- 评估目前在麻醉学中使用的方法,对从中位数和四分位数中估计的平均值和SD进行元分析.
- 在各种模拟条件下评估这些估计方法的准确性,这是麻醉学研究的代表.
主要方法:
- 模拟的日志正常数据采用不同的样本大小 (n=15,27,51) 和变化系数 (CV=0.15,0.3,0.5).
- 应用罗等人. 的,万等等. 的,麦格拉斯等人. " (量子估计和Box-Cox转换),以及Cai等人. "的 (最大概率估计) 方法.
- 计算了对平均值和SDs的比率的概括置信区间.
主要成果:
- 所有评估的方法都产生了低于预期的95%的置信区间覆盖率,无论是平均值还是SDs.
- 罗等. 这就是为什么. 和万等等. 这就是为什么. 方法显示,平均比率的覆盖率从92.4%到93.6%,SDs从79.2%到89.6%.
- 麦克格拉斯等研究人员. "的方法和Cai等人. "的方法表明覆盖率较低,特别是对于SDs.
结论:
- 目前在麻醉学元分析中,从日志正常数据的四分位数中估计平均值和SD的方法是不够的.
- 报告的P值<0.05可能是不可靠的,因为不能靠谱的统计推断.
- 建议修订报告标准,包括报告四分位数,平均值,SD或偏斜变量的原始数据.
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