混杂偏倚

结论在对医院资料进行统计分析时，应遵循观察性研究的原则和方法，以避免可能存在的信息偏倚、选择偏倚和混杂偏倚。

Conclusion The principles and methods for observational studies should be followed to reduce information bias , selection bias and confounding bias in statistical analysis of hospital data .

他认为在这种观察性研究中存在着混杂偏倚。

He accepted that there was potential for a confounding bias in such observational registries .

本文还讨论了交互作用与生物学联合作用、混杂偏倚及其控制。

Interaction , combined effect , confounding and its control were also discussed in this paper .

公平地比较住院死亡率要求对病人基线死亡风险的混杂偏倚进行充分调整。

Fair comparisons of hospital mortality rates require thorough adjustments for differences among patients in baseline mortality risk .

结果聚类分层分析提高了分层分析效率，有效地控制了混杂偏倚，避免了错分偏倚的产生。

Results The efficiency of stratification analysis was improved and the confounding bias was effectively controlled with information bias avoided when the clusters stratification analysis was applied .