Figure 1.

C-reactive protein (CRP) in (A) saliva samples (n=102, shown are mean values of measurements in morning and evening saliva), and (B) sera (n=96). Participants were grouped into two age classes (45–59 years and 60–69 years, respectively) and compared using Mann-Whitney U test. Box plots reflect the interquartile range (IQR) with the median shown as a line and the 5^th–95^th percentiles as bars (* p<0.05). Spectrophotometric measurement of salivary total protein levels in morning and evening samples of the first (d₁) and third day (d₃) of sampling. (C) Differences in morning and evening levels of the same day were identified by Wilcoxon tests. Box plots reflect the IQR with the median shown as a line and the 5^th–95^th percentiles as bars (** p<0.01). (D) The four related total protein levels shown for each participant.