Figure 4.

Bland–Altman graphs showing the level of agreement between serum C-reactive protein (CRP) and CRP in morning saliva for all participants (A), those aged 45–59 (B) and those aged 60–69 years (C). Bland–Altman graphs reflecting the level of agreement between serum CRP and CRP in evening saliva for all participants (D), those aged 45–59 (E) and those aged 60–69 years (F). Data are based on analysis of 99 morning and 97 evening samples. Interchangeability was only suggested among participants aged 60–69 years for morning (p=0.26) as well as evening (p=0.94) saliva.