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Table 5 Correlation between the indexes of ultrasonic grading and clinical and laboratory parameters

From: Comparison of the clinical effectiveness of US grading scoring system vs MRI in the diagnosis of early rheumatoid arthritis (RA)

Clinical and laboratory parameters r (GSUS) r (PDUS) r (bone erosion)
Duration of disease 0.09 0.16 0.40*
DAS28 0.13 0.39* − 0.15
CRP 0.31* 0.39* 0.16
ESR 0.13 0.41* − 0.05
RF 0.30* 0.12 0.35*
CCP 0.18 0.29* 0.37*
  1. *P < 0.05, statistically significant