MPO and periodontitis: Additionally, the area under the curve (AUC) values between smokers periodontitis and control for salivary citH3, ELA, CALPRO, and MPO were 0.991-1,000, and the AUC between periodontitis nonsmokers and control for the selected markers was 0.964-1,000 also between smokers and nonsmokers periodontitis group was 0.878-0.750, as shown inTable 8.