At the last follow-up evaluation , the mean differences between the groups with regard to the WOMAC gains , adjusted for baseline values , were near zero ( for @ patients in the per-protocol analysis ) : -@ % ( @ % confidence interval -LSB- CI -RSB- : -@ % , @ % ) for the total score , -@ % ( @ % CI : -@ % , @ % ) for pain , -@ % ( @ % CI : -@ % , @ % ) for stiffness , and -@ % ( @ % CI : -@ % , @ % ) for function .