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Table 3 Correlation between musculoskeletal ultrasound scores and calprotectin, acute phase reactants and disease activity indices

From: Calprotectin and TNF trough serum levels identify power Doppler ultrasound synovitis in rheumatoid arthritis and psoriatic arthritis patients in remission or with low disease activity

  RA (n = 42) PsA (n = 50)
Doppler score
 Calprotectin 0.570a 0.420b
 CRP 0.338b 0.058
 ESR 0.285 0.337b
 Albumin −0.259 −0.322b
 DAS28-ESR 0.380b 0.384b
 SDAI 0.126 0.071
 CDAI 0.080 0.115
SH score
 Calprotectin 0.589a 0.423b
 CRP 0.044 0.092
 ESR 0.217 0.020
 Albumin −0.336b −0.210b
 DAS28-ESR 0.423b 0.284b
 SDAI 0.275 0.217
 CDAI 0.163 0.277
Global score
 Calprotectin 0.641a 0.446a
 CRP 0.105 0.122
 ESR 0.226 0.111
 Albumin −0.332b −0.237
 DAS28-ESR 0.446b 0.348b
 SDAI 0.280 0.195
 CDAI 0.172 0.266
  1. Abbreviations: CDAI Clinical Disease Activity Index, CRP C-reactive protein, DAS28-ESR 28-joint Disease Activity Score based on erythrocyte sedimentation rate, ESR erythrocyte sedimentation rate, PsA psoriatic arthritis, RA rheumatoid arthritis, SDAI Simple Disease Activity Index, SH synovial hypertrophy
  2. Data presented are Spearman’s ρ correlations
  3. a p < 0.001
  4. b p < 0.05