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When randomized trials aren’t possible, researchers can use observational studies to learn how treatments work. In observational studies, researchers look at what happens when patients and their doctors choose the treatments. Traits such as age or health may affect treatment choices. These traits may also affect patients’ responses to treatment, making it hard to know if the treatment or the traits affected the patients’ responses.

Statistical Methods to Measure Treatment Effect Using Observational Data Versus Randomized Trials