The 441 early arthritis patients included the following diagnoses: RA according to the 2010 classification criteria (n=157), unclassified arthritis (n=148), psoriatic arthritis or spondyloarthritis (n=45), inflammatory osteoarthritis (n=23), crystalarthropathy (n=21), remitting seronegative symmetrical synovitis with pitting edema (n=12), reactive arthritis (n=7) and another diagnoses (n=28). The 30 early arthritis patients that were used to determine the reliability of change scores included the following diagnoses: RA according to the 2010 classification cirteria (n=21), unclassified arthritis (n=6), inflammatory osteoarthritis (n=2), and remitting seronegative symmetrical synovitis with pitting edema (n=1). 29 out of the 30 patients received DMARDs, one received NSAIDs only.