观察研究
医学
随机化
魔术(望远镜)
临床试验
随机对照试验
外科
内科学
量子力学
物理
作者
Rory Collins,Louise Bowman,Martin Landray,Richard Peto
标识
DOI:10.1056/nejmsb1901642
摘要
Nonrandomized observational analyses have been promoted as alternatives to randomized clinical trials. However, randomization ensures balance between groups, whereas nonrandomized studies are often biased by between-group differences. Efforts to reduce the cost and complexity of clinical trials are preferable to relying on observational studies.
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