Aboslutely. I&#x27;ll admit to not having read the actual study, but saying that 33% of pilots improved is fairly meaningless.  You could also say that 67% of pilots <i>didn&#x27;t</i> improve.<p>It might even be the case that those 67% that didn&#x27;t improve had half of them get worse.  In which case we&#x27;d have 1&#x2F;3 improve, 1&#x2F;3 no change and 1&#x2F;3 get worse.  Or in other words, a boring average distribution that means absolutely nothing...