Table 5.

Diagnostic properties for ordinal regression model

Model	Severity of detected PD	Sensitivity (%)	Specificity (%)
Age + number of teeth	Mild, moderate or severe versus no	91.7	39.6
	Moderate or severe versus no or mild	49.5	85.8
	Severe versus no, mild or moderate	20.7	100
Age + 6 patient-reported items	Mild, moderate or severe versus no	84.8	57.3
	Moderate or severe versus no or mild	63.1	84.8
	Severe versus no, mild or moderate	27.6	99.6

Sensitivities and specificities for the detection of different levels of PD with the score derived from the ordinal regression model