Table 4.

Concordance of score and dentist’s assessment

Classification of PD by score (age + 6 patient-reported items)	Dentist’s assessment of PD
	No	Mild	Moderate	Severe	Total
No	55	29	2	0	86
Mild	32	51	34	2	119
Moderate	9	21	37	19	86
Severe	0	0	1	8	9
Total	96	101	74	29	300

Comparison of classification of PD with the help of the PD score and the reference standard