CRP and rheumatoid arthritis: Patients with RA treated with biological DMARDs (n = 48) had a significantly lower serum CRP concentration [0.05 mg/dL (0.04–0.13 mg/dL)] than that not receiving biological DMARDs [n = 88; 0.16 mg/dL (0.08–0.55 mg/dL)] (P < 0.001).