On P1999 I get 5 HP per stamina at level 60. Returns scale with level so stamina is pretty crummy at low-mid levels. If you expect never to level up too far, STR helps with carrying armor and such. At high levels stamina becomes more important.
I don't know the precise formula but I can't imagine it matters that much. No point in min-maxing a level 30 character.
Danth
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