As far as I remember it was a mix of body and mind, more body than mind without any points on focus. But I really don't remember any numbers, since I had tons of characters, all with different attribute builds.
On level 50 you had around 8800 HP so the HP curve was something like 500 - 8800 from level 1 to 50.

Too bad i didn't capture all these values, but I never thought they would be useful ever again.*sighs*