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Table 2 Spearman’s rank correlation coefficients between serum calprotectin and clinical, laboratory and ultrasound parameters

From: Serum calprotectin (S100A8/9): an independent predictor of ultrasound synovitis in patients with rheumatoid arthritis

Parameter CRP ESR DAS28 GS syn PD syn GS ten PD ten
Calprotectin 0.629** 0.370* 0.430** 0.359* 0.497** 0.192 0.210
CRP   0.636** 0.650** 0.451** 0.463** 0.314 0.314
ESR    0.659** 0.376* 0.428** 0.300 0.300
DAS28     0.631** 0.707** 0.226 0.269
GS syn      0.700** 0.252 0.267
PD syn       0.226 0.303
  1. **Correlation significant at the 0.01 level; *correlation significant at the 0.05 level. CRP C - reactive protein, ESR erythrocyte sedimentation rate, DAS28 28 joint disease activity score with ESR, GS syn Grey scale synovitis score, PD syn Power Doppler synovitis score, GS ten Grey scale tenosynovitis score, PD ten Power Doppler tenosynovitis score