CRP and rheumatoid arthritis: Cervical spine involvement was linked with longer duration of RA (15 years (range: 9.0–27.0) vs. 9 (4.0–16.0, p = 0.007), presence of RF (39 (60%) vs. 12 (35%); p = 0.010), elevated CRP (19.0 (7.0–32.0) vs. 11.5 (6.3–19.8); p = 0.016) and ESR (35.0 (19.0–58.0) vs. 28.0 (13.3–48.8); p = 0.025).