Combinations of periodontitis score with inflammation score and mean CAL with CRP were the main focus, but Additional file 1: Table S5 provides a summary for all 96 different pairings (8 periodontal variables × 4 inflammation variables × 3 mortality types): there was a noticeable additive interaction between measures of PPD, which best reflects current periodontal inflammation, and fibrinogen, CRP and inflammation score, but not with leukocyte levels. This evidence concerns the gene CRP and periodontitis.