Table 1.

Basic information of enrolled patients.

Index	Value range	Mean ± SD
Age (years)	25–55	42.8 ± 9.9
Duration of RA (month)	1–240	57.4 ± 56.9
X-ray score	0–2	0.18 ± 0.47
Rheumatoid factor	0–673	135.6 ± 177.0
Erythrocyte sedimentation rate (mm/h)	4–140	43.9 ± 35.6
C-reactive protein (mg/L)	0–185	13.0 ± 34.1