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This infographic presents eight distinct levels of scientific evidence arranged in a pyramid that reflects a spectrum of quality. Levels of evidence at the bottom are significantly more prone to error and bias than those at the top. The pyramid is reflective of the process of science itself: as initial hypotheses about a given question are tested, they are either disproven and discarded or they survive to be tested further. As more rigorous studies are completed, and as their results are compiled and analyzed, the picture painted by the evidence becomes clearer and more compelling.
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