Table 1.

Intra- and inter- examiner agreement in measurement of DIAGNOdent Pen values quantified by Cohen’s Kappa.

Observation Type	Kappa Score (K)
Intra-examiner agreement (examiner 1)	0.89
Intra-examiner agreement (examiner 2)	0.85
Inter-observer agreement	0.79

K<0.40 poor agreement, K=0.41−0.60 moderate agreement, K=0.61−0.80 substantial agreement, K<0.75 almost perfect agreement.