Table 4 showed the results of comparison analysis of RA patients with 25(OH)D deficiency and normal groups. As shown in Table 4, there were no significant differences in age, sex, height, weight, BMI, disease duration, swelling and tenderness joint count, duration of morning stiffness, visual analogue scale (VAS), C-reactive protein (CRP), erythrocyte sedimentation rate (ESR), rheumatoid factor (RF), and DAS28 score (P > 0.05). Here, CRP is linked to rheumatoid arthritis.