Table 3.

Agreement (Kappa statistics) between different periodontal disease definitions

Periodontal disease definition	Kappa statistics
	Beck et al.20	Machtei21	Lopez et al.22	Page and Eke23 (moderate)	Page and Eke23 (severe)	Borrell et al.24
Hujoel et al.19	0.86 *	0.56*	0.88*	0.53*	0.55*	0.85*
Beck et al.20	1	0.69*	0.88*	0.44*	0.67*	0.78*
Machtei21		1	0.67*	0.26*	0.98*	0.50*
Lopez et al.22			1	0.45*	0.65*	0.80*
Page and Eke23 (moderate)				1	0.25*	0.62*
Page and Eke23 (severe)					1	0.48*
Borrell et al.23						1

^*P <0.05.