Much of what medical researchers conclude in their studies is misleading, exaggerated, or flat-out wrong. So why are doctors—to a striking extent—still drawing upon misinformation in their everyday practice?
The arguments presented in this article seem like a good if somewhat long presentation of the general problem, and could be applied in many fields besides medicine. (Note that the comments on the article rapidly become an argument about global warming.) The same problems are also seen in the work of bloggers, journalists and “experts” who specialize in popular health, finance, relationship and other topics and have created entire advice industries out of appeals to the authority of often poorly designed studies. The world would be a better place if students of medicine, law and journalism were forced to study basic statistics and experimental design. Anecdote is not necessarily invalid; study results are not necessarily correct and are often wrong or misleading.
None of this is news, and good researchers understand the problems. However, not all researchers are competent, a few are dishonest and the research funding system and academic careerism unintentionally create incentives that make the problem worse.
(Thanks to Madhu Dahiya for her thoughtful comments.)