We investigated the relationship between RA disease activity indices (DAS28-CRP, SDAI, and CDAI)/roentgenographic joint destruction assessment (mTSS)/simple ADL assessment (mHAQ) and physical function assessments (10 MWT, TUG, FRT, and DASH)/detailed ADL assessment (FIM)/QOL assessment (SF-36) used in rehabilitation therapy. Here, CRP is linked to rheumatoid arthritis.