Association between patient characteristics and radiographic progression at two years.

Data are presented as median (interquartile range) or number (%).
†P-values represent the comparison between the radiographic progression group and non-progression group.
§ = antibody positivity. ACPA = anti-cyclic citrullinated peptide antibody, DAS28 = disease activity score in 28 joints, ESR = erythrocyte sedimentation rate, CRP = C-reactive protein, TNF-α = tumor necrosis factor alpha, HDL = high density lipoprotein, and LDL = low density lipoprotein. The positive cut-off value for ACPA was ≧5 U/ml.