CRP and periodontitis: Crude survey-weighted Cox models (S1 Table) revealed that the periodontitis status (present or absent) and CRP levels (≤ 0.5 mg/dL or > 0.5 mg/dL) were associated with mortality, demonstrating HRs of 3.0 (95% CI, 2.54–3.55) for periodontitis status and 1.37 (95% CI, 1.08–1.74) for the CRP levels.