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Table 3 Perceived and normative assessment of periodontal health.

From: Self – perceived and clinically diagnosed dental and periodontal health status among young adults and their implications for epidemiological surveys

Normative Perceived CPITN 3–4 CPITN 0–2 Total
Bad TP 46 FP 771 817
Good FN 118 TN 3520 3638
Total 164 4291 4455
  1. • TP = True Positive • FP = False Positive • FN = False Negative • TN = True Negative • Sensitivity (TP/(TP+FN)) = 0.28 (95%CI 0.21–0.35). • Specificity (TN/(TN+FP)) = 0.83 (95% CI 0.81–0/83). • Positive Predictive Value (TP/(TP+FP)) = 0.05 • Negative Predictive Value (TN/(TN+FN)) = 0.97 • Overall Proportions = 817 participants (18%) reported having bad periodontal health status compared to 164 (3.7%) clinically periodontal disease diagnosed subjects (McNemar test, p = <0.000001).