CRP and rheumatoid arthritis: In the multivariate analysis investigating the factors associated with the involvement of the odontoid process in RA patients, the male sex (OR (95% CI)): 2.93 (1.14–7.54); p = 0.025), CRP (per unit increment) (1.12 (1.01–1.24)); p = 0.031), and anti-CCP positivity (2.75 (1.26–5.98); p = 0.011) were found to be independently associated.