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.

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。

youdao

One limitation of this report is the lack of randomization for any observational design that can mislead for selection bias;

报告的一个局限性就是观察设计没有随机化，可能误导为选择偏倚。

youdao

They are artifacts of something we call immortal time bias in observational studies.

他们是我们在观察性研究中称作恒定时间偏倚的人工制品。

youdao

In the new work he presented to the meeting, he looked systematically at the causes of bias in such research and confirmed that the results of observational studies are likely to be completely correct only 20% of the time.

ECONOMIST: Why so much medical research is rot