anyone under 6'2" should pause and contemplate the implications of that.

Um, I don't think you're using this correlation correctly. Because we have a model where nutritional deficiencies lead to both short height and low IQ, the amount of information we get is dependent on where we are in the height and IQ spectrum. Basically, if you're uncharacteristically short, say -2 sigma or lower, then you should be worried; if -1 sigma or lower, a slight suspicion; 0 or higher, little information, rather than the "if you aren't more than +1.3 sigma, contemplate."

Except that this correlation is much less informative than, say, IQ tests.