There’s nothing inherently wrong with observational studies. RCTs and observational studies may be on different rungs (or tiers) in the hierarchy of evidence, but that only means we have to put their conclusions into the proper context. This, of course, is not always easy for laymen like us.
There’s nothing inherently wrong with observational studies. RCTs and observational studies may be on different rungs (or tiers) in the hierarchy of evidence, but that only means we have to put their conclusions into the proper context. This, of course, is not always easy for laymen like us.