| 
      
        |  | RA patients (n=18) | Healthy controls (n=18) |  
        | Age mean ± SD in    years | 60.4 ± 13.8 | 46.4 ± 18.2 |  
        | Female:Male  ratio | 1:1.6 | 1:2 |  
        | Duration of RA,    y,  median (range) | 12 (2-34) |  |  
        | DASb median    (range) | 4.4 (1.26-7.5) |  |  
        | Methotrexate, n    (%) | 10/18 (55.5) |  |  
        | Prednisone, n (%) | 4/18 (22.2) |  |  
        | Plaquenil, n (%) | 6/18 (33.3) |  |  
        | RAa, rheumatoid arthritis; bDAS, disease    activity score |  |