Table 3 Area under the curve (AUC) and sensitivity and specificity at the optimal cutoff for DD based on all surfaces and by DD machine and tooth surface.

From: The accuracy of laser fluorescence (DIAGNOdent) in assessing caries lesion activity on root surfaces, around crown margins, and in furcations in older adults

Surface/Machine

AUC (95% CI)

Optimal DD cutoff

Sensitivity

Specificity

All surfaces

0.911 (0.855–0.967)

25

90.8%

74.0%

Machine

  1

0.926 (0.814–1.000)

30

93.8%

78.1%

  2

0.921 (0.826–1.000)

30

89.9%

76.7%

  3a

0.941 (0.872–1.000)

20

92.5%

77.9%

Tooth surface

  Distal or mesial

0.922 (0.836–1.000)

20

98.4%

75.8%

  Facial or lingual

0.923 (0.842–1.000)

35

88.3%

83.6%

Surface area

  Root

0.954 (0.928–0.980)

25

89.1%

86.3%

  Furcation and crown margin

0.829 (0.685–0.972)

45

67.9%

78.3%

Tooth position

  Posterior

0.899 (0.816–0.982)

40

72.4%

87.1%

  Anterior

0.958 (0.910–1.000)

25

86.5%

88.9%

  1. aDue the smaller sample sizes which produced training data sets with no variation in caries status (either all inactive or active caries) using tenfold cross-validation, fivefold cross-validation was used when the data were restricted to Machine 3.
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