Table 1

Patient characteristics

20002001200220032004    /200720082009201020112012
N90786410341019956114110991210123312701175
Male (%)62.160.859.459.258.762.764.566.566.164.765.7
Age, years (mean)48.850.049.849.950.347.748.147.748.948.749.4
Disease duration, years (mean±SD, median)15.7±12.516.0±12.115.4±12.015.8±12.316.3 ±12.215.3±12.315.7±12.316.1±12.116.8±12.117.3±12.318.9±12.3
13.013.012.013.013.312.013.013.114.314.916.9
Disease duration at first visit to a rheumatologist, years (mean±SD, median)6.8±9.47.6±9.67.5±9.86.9±9.57.1±9.85.8±8.95.5±9.05.0±7.95.4±8.25.6±8.45.8±8.6
3.03.33.02.63.01.31.01.01.71.72.0
Disease severity (%)
 Asymptomatic/mild24.120.520.116.316.631.526.933.534.528.429.0
 (Very) severe21.520.720.419.925.118.014.315.810.613.315.7