Big problem with science like this - they can only comfortably release whatever findings they have - based upon what society deems non-offensive.
it's a big can of worms. You can comfortably release group statistics - height, weight, even penis size, right? But to delve deeper into it, well, it incites groups who like to be offended. Inside every group/population subset is a small yet vocal contingent (who the media loves to cover due to the emotional responses from viewers).
You can't release data like this with the PC society of today. Despite however sound science might be behind it - a very small group will declare itself to be spokesmen for that whole group, and will boycott businesses/cost the scientists money, until they get their way.
Hypothetical. Suppose scientists found that Eskimos have higher intelligence, bigger penises, better cheekbones, and better bench press stats,,, than white guys. Would I be offended? Nah. I'd be interested in the stats, how they found them, if the science was sound, etc. It's simple observation - nothing to disparage me. But, there would be a small group of white guys who would act offended, and they'd be on FOX news tonight with OReilly, talking about this "racist" study which "destroys equality for whites".
Whiny bitches. yet in our PC society - which we readily admit is 90% non-thinking sheep- it works. it gives people something to talk about over "Everyone loves raymond" repeats with their Taco bell dinner and daily mindless chatter, designed of course, as it removes some coverage from the war or the billions spent each week on it.