Abstract
We aimed to clarify the degree of improvement in disease control following early treatment of rheumatoid arthritis (RA) in daily clinical practice in 2006 compared to that in 2001. Using a large observational Japanese RA cohort (IORRA), we analyzed changes in clinical parameters, including disease activity assessed by the disease activity score 28 (DAS28) and physical disability assessed by the Japanese version of the Health Assessment Questionnaire (J-HAQ), which occurred within 2 years of cohort inception. All patients had enrolled in the IORRA cohort within 1 year of RA onset, in either 2001 (2001-cohort) or 2006 (2006-cohort). For both cohorts, changes in clinical features over 2 years were compared by Fisher's exact test or the Wilcoxon test. The 2001-cohort included 71 patients and the 2006-cohort included 56 patients. Over the 2-year period for each cohort, DAS28 significantly decreased from 3.9 to 3.5 in the 2001-cohort (p < 0.001) and from 4.1 to 3.1 in the 2006-cohort (p < 0.0001), and J-HAQ significantly decreased from 0.62 to 0.49 (p < 0.02) in the 2001-cohort and from 0.71 to 0.41 (p < 0.001) in the 2006-cohort. Greater improvement in disease activity over 2 years occurred in the 2006-cohort than in the 2001-cohort (p < 0.05). Better disease control was obtained following changes in RA treatment strategy that occurred in Japan between 2001 and 2006.
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