While one should be skeptical of national time trends as evidence of causation, the similarity in trend is suggestive and indicates that a deeper analysis is in order. (educationnext.org)
There is some correlation between aggressive behavior and testosterone levels, but most research lacks evidence of causation, and some results are contradictory. (discovermagazine.com)
So it is important to use careful wording so as not to confuse association and causation, but not so important to recommend dietary changes that are based on solid evidence of causation? (westonaprice.org)