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Table 3 Accuracy of Demirjian’s classification of the lower third molar in estimating age of young Ugandans

From: Accuracy of the lower third molar radiographic imaging to estimate age among Ugandan young people

Age cut-off (years) Tooth No. Sensitivity (%) Specificity (%) AUC (95% CI) PPV NPV +LR −LR
12 38 496 92.0 80.3 0.86 (0.81 to 0.91) 0.97 0.63 4.7 0.1
48 494 92.9 80.3 0.87 (0.82 to 0.91) 0.97 0.66 4.7 0.1
14 38 496 97.4 83.2 0.90 (0.87 to 0.93) 0.93 0.93 5.8 0.0
48 494 97.4 82.9 0.90 (0.87 to 0.93) 0.93 0.93 5.7 0.0
16 38 496 68.8 97.4 0.83 (0.80 to 0.86) 0.97 0.73 26.7 0.3
48 494 68.7 96.9 0.83 (0.80 to 0.86) 0.96 0.73 22.5 0.3
18 38 496 88.0 87.8 0.88 (0.85 to 0.91) 0.79 0.94 7.2 0.1
48 494 85.9 86.7 0.86 (0.83 to 0.90) 0.77 0.92 6.5 0.2
  1. No. is number of observations. The difference between the test sample number, 501 and number of teeth on each side (Right—494 and left—496) is accounted for by missing teeth or those that had not yet commenced mineralisation. PPV, NPV, +LRF and −LR are positive predictive value, negative predictive value, positive likelihood ratio and negative likelihood ratio, respectively