That’s interesting, I know the one I have now can go between the two and is just defaulted to F, but growing up the one in my childhood home only showed F. I never really understood the numbers in relation to the temp either, I just would notch it up or down a few degrees depending on how cold I was 😂
Something to keep in mind with studies are outside social factors such as less women playing chess and less women being exposed to chess at a young age. There are fewer women in chess and fewer girls learning chess, for probably centuries. This will have a factor when comparing two demographics.