XC could improve HAQ , DAS-28 , hypersensitive C reactive protein ( hs-CRP ) , prostaglandins A ( PGA ) , erythrocyte sedimentation rate ( ESR ) , number of swelling joints , number of tender joints , and morning stiffness time in acute RA patients , showing statistical difference when compared with those of the control group ( P < 0.01 , P < 0.05 ) .