CRP and rheumatoid arthritis: The median CRP was 3.4 mg/L (range 0.20–126.90 mg/L) in the RA outpatient population, 2.2 mg/L (range 0.10–416.20 mg/L) in the non-RA outpatient population, and 0.18 mg/L (range 0.01 to 18.01 mg/L) in NHANES.