Anyone could have guessed this, because it's common sense. But the purpose of science is to produce knowledge based on empirical evidence. Common sense has its place, but science wants to test everything. According to a scientist it's not a fact just because it's common sense. Now this fact is part of the body of scientific evidence, and that is a powerful thing.
If you are trying to figure out why men are so inclined to math/CS, I think it makes a lot of sense to start at the very bottom of the problem; what do their brains look like when they are literally doing the thing? We can officially rule that out, so now we can fairly move up the chain and introduce more complex questions.