I had read a study about this when our son was diagnosed about 11 yrs. ago; a study (studies?) had shown that kids with CAH had an average of 10 points higher IQ than average, and that it was linked chromosomally (just as lower IQ's are linked chromosomally in kids with Down's Syndrome). Who knows what the latest results are on this subject?! My daughter seems very bright for her age, and my son was too, but - just as the other lady mentioned - I may be a very biased mother!