Fig. 2From: A new screening method for periodontitis: an alternative to the community periodontal indexDiagnostic chart for periodontal screening by salivary Hb and LD levels. The cutoff points for Hb and LD were 1.25 μg/mL and 298 IU/L, respectively. When samples were positive for both Hb and LD, the positive predictive value was 91.7 %. When both Hb and LD were negative, the negative predictive value was 75.0 %Back to article page