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

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

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*