In studies with small sample sizes, imbalances between the two groups can easily occur despite randomisation .

在小样本研究中，尽管采用了随机法，但两组间偏倚还是很容易发生的。

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A total of 14 641 US male doctors aged over 50 enrolled, 754 of whom (5.1%) had cardiovascular disease at randomisation.

在招募的总数为14641名超过50岁的男性医师中，754人（5.1%）当时已有心血管疾病。

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The authors tested the hypothesis that genetically elevated plasma CRP causes COPD using a Mendelian randomisation design.

作者使用孟德尔随机化方法评价了遗传性血清高CRP引起COPD的假设。

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This uses a process of randomisation and trial-and-error (akin to mutation and selection in biological evolution) to search the vast number of possible microstructures to find the most suitable design for each subsection.

ECONOMIST: MONITOR