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Table 2 Spearman's rank correlations between the laboratory variables and sum B-mode/power Doppler scores

From: The soluble biomarker calprotectin (a S100 protein) is associated to ultrasonographic synovitis scores and is sensitive to change in patients with rheumatoid arthritis treated with adalimumab

  Baseline 1 month 3 months 6 months 12 months
Calprotectin 0.45*/0.38 0.37/0.53* 0.76**/0.72** 0.60**/0.56* 0.59**/0.60**
SAA 0.42/0.37 0.30/0.30 0.58**/0.37 0.61**/0.51* 0.48*/0.45*
CRP 0.33/0.34 0.04/0.11 0.49*/0.35 0.59**/0.43 0.57**/0.55*
ESR 0.37/0.48* 0.36/0.35 0.45*/0.42 0.32/0.33 0.35/0.40
  1. *P < 0.05, **P < 0.01
  2. CRP, C-reactive protein; ESR, erythrocyte sedimentation rate; SAA, serum amyloid-A