I don't think you can really gather any data from this unless you start looking to IQ scores as well. This board leans heavily towards 99.8%+ and it's hardly a good representation of gifted community (it sure is the right place for us).
Not to mention that there are 2e issues and the fact the parents do not remember when the kids did what. I have no idea when the kids counted or wrote letters. I think writing letters is more about fine motor skills than anything else. My older one never sounded out words either, he too just started reading words.
To me Ruff's milestones are not that meaningful and just because child doesn't do anything doesn't mean she/he is not HG. (I think my kids have quite impressive list so it's not about them.)
Davidson application no longer contains list of milestones and my guess would be it's for the reasons I mentioned above.
