Likewise, the median CRP concentration was higher in patients with severe periodontitis than in those without (17.1 mg/L, IQR 5.8–36.6 mg/L vs. 12.4 mg/L, IQR 6.7–27.1 mg/L), but there was no statistically significant difference (P = 0.08) (Table 3). Here, CRP is linked to periodontitis.