Table 3.

Community Periodontal Index (CPI) values and hemoglobin (Hb) and lactate dehydrogenase (LD) levels at screening

	Cutoff	P	Sensitivity	Specificity	Positive predictive value	Negative predictive value	Crude hit rate	Yorden’s index	AUC-ROC
CPI	3	<0.001	0.964	0.789	0.869	0.938	0.892	0.753	0.954
Hb (μg/mL)	1.25	<0.001	0.764	0.763	0.824	0.690	0.763	0.527	0.846
LD (IU/L)	298	<0.001	0.709	0.711	0.780	0.628	0.710	0.420	0.737

Sensitivities, specificities, positive and negative predictive values, Youden’s index and areas under the receiver operator characteristics curve (AUC-ROC) for periodontitis were calculated. P values were calculated using Fisher’s exact test

Hb hemoglobin, LD lactate dehydrogenase, CPI Community Periodontal Index