医学循证评论者

「吃药的人活得更久」——永生时间偏倚:一个凭空出现的分母

【锚点】这一篇只回答一个问题:为什么「用药组死亡率更低」这个观察,可以在药物完全无效时也稳定出现;以及为什么这个错误在药物流行病学里能反复复活三十年。 --- 一、一个真实的数字 上世纪末到本世纪初,有一批队列研究说:COPD 患者用 β 受体阻滞剂,死亡率更低,RR≈0.68。看起来很硬。Suissa 2008 在 American Journal of Epidemiology…

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