Hi Vivace, tks so much for this. I googled and found the following:

http://newideas.net/adhd-online-test-screening

It's interesting, but I still get led back to the inattention bit, ie, I don't know why he's inattentive.

I read that coffee below a certain age can lead to poor height growth, and DS is a bit vertically challenged (DH and I were late developers). I'll look into this though.