On the Patient Global Impression of Change , @ % ( @/@ ) , @ % ( @/@ ) , @ % ( @/@ ) , and @ % ( @/@ ) of patients in the tapentadol ER group reported that their overall condition was `` very much improved , '' `` much improved , '' `` minimally improved , '' and `` not changed , '' respectively , at Week @ compared with @ % , @ % ( @/@ ) , @ % ( @/@ ) , and @ % ( @/@ ) reporting these ratings at Week @ .