The SDAI is a validated measure of rheumatoid arthritis disease activity. Twenty-eight tender joint counts, 28 swollen joint counts, global disease activity assessed by the participant on a visual analogue scale from 0 to 10 (cm) , global disease activity assessed by an investigator on a visual analogue scale from 0 to 10 (cm), and serum levels of C-reactive protein (mg/dL) were included in the SDAI score. Scores on the SDAI range from 0 to 86. An SDAI score ≥26.1 indicates high disease activity, an SDAI score between 11.1 and 26.0 indicates moderate disease activity, an SDAI score between 3.4 and 11.0 indicates low disease activity, and an SDAI score ≤3.3 indicates clinical remission.