Table 7 Confusion matrix for digital radiograph measurements.

From: Reliability of impedance spectroscopy versus digital radiograph and ICDAS-II in occlusal caries detection: a prospective clinical trial

Parameter

ICDAS

RG

n (%)

χ2

p-value

Cohen’s kappa (95% CI)

Negative

Positive

Enamel caries

Negative

81 (100.00%)

0 (0.00%)

NA

NA

1.000 (1.000:1.000)*

Positive

0 (0.00%)

20 (100.00%)

Dentinal caries

Negative

81 (100.00%)

0 (0.00%)

29.00

 < 0.001*

0.574 (0.434:0.714)*

Positive

29 (45.31%)

35 (54.69%)

Overall

Negative

81 (100.00%)

0 (0.00%)

29.00

 < 0.001*

0.651 (0.534:0.767)

Positive

29 (34.52%)

55 (65.48%)

  1. CI Confidence Interval, *Significant (p < 0.05).
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