Fig. 4

Receiver operating characteristic (ROC) curves differentiating healthy from generalized periodontitis patients with and without CHD, by comparing salivary IL-1β levels between the control group (C) versus (a) generalized periodontitis (P) patients, (b) CHD and clinically healthy periodontium (AS-C) patients; and (c) CHD with generalized periodontitis (AS-P) patients. Further ROC curves distinguishing between generalized periodontitis (P) patients versus (d) CHD and clinically healthy periodontium (AS-C) patients, (e) CHD with generalized periodontitis (AS-P) patients; in addition to (f) between CHD and clinically healthy periodontium (AS-C) patients and CHD with generalized periodontitis (AS-P) patients. Data were obtained by logistic regression analysis (all p < 0.0001)