ATSRxPodcast: The Science Behind Drug Interactions: Impact of Observational vs. Causality in Interactions Affecting Acute Care Drugs
Breathe Easy
The Immortal Time Bias
Study design is key to avoiding confounding by indication, he says. "Immortal time bias" can build in a protective effect for patients that are treated. Selection bias occurs when exclusion based on things that happen after time zero. And the way in which we include patients into a study is associated with the outcome.
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