Interestingly, almost 80 % of participants rated their intelligence as above average, with males reporting significantly higher self-estimated intelligence scores than females. However, we found no significant relationship between self-estimated intelligence and ICAR-16 scores. These results suggest that there may be a discrepancy between our perceived intelligence and our actual cognitive ability, or that we may have a fallacious understanding of our intelligence levels.
because dunning-kruger is something else than you think - it has nothing to do with intelligence:
In popular culture, the Dunning–Kruger effect is often misunderstood as a claim about general overconfidence of peoplewith low intelligence instead of specific overconfidence of people unskilled at a particular task.
https://en.wikipedia.org/wiki/Dunning–Kruger_effect
Yes, I’ve read the Wikipedia article. That sentence is a little misleading, as the original study was arguably about both.
Edit: …with the reasoning tests being a crude proxy for intelligence.
Note that I was careful not to mention intelligence in my original post either.