Fig. 3

Relationship between joint index vector and various measures of rheumatoid arthritis. The mean values of |Vxy| (open bar) and z (solid bar) stratified by a Steinbrocker class, b the disability index of the Health Assessment Questionnaire (HAQ-DI), c disease duration, and d disease activity state defined by Simplified Disease Activity Index (SDAI) as remission (≤ 3.3), low disease activity (LDA, ≤ 11), moderate disease activity (MDA, ≤ 26), and high disease activity (HDA, > 26). Error-bar indicates standard error of the mean