CRP and rheumatoid arthritis: The SAP group was characterized by a significantly lower CRP (p = 0.0055 and p = 0.0005, respectively), ESR (p = 0.010 and p < 0.0001, respectively) and TJC (p = 0.0002 and p = 0.0071, respectively) when compared to SP RA and SN RA patients (Table 1).