Table 3.

Intra-observer performance (six observers, O1 to O6) for the dental arch relationship (DAR) component of the EUROCRAN index

	Observer	Reliability	Mean diff.	95 % CI of mean diff	p value	DME	Kappa
Plas-M	O1	0.923	0.143	[−0.075…0.360]	0.186	0.338	0.667
	O2	0.822	0.000	[−0.322…0.322]	1.000	0.500	0.745
	O3	0.931	0.095	[−0.103…0.294]	0.329	0.309	0.745
	O4	0.857	0.190	[−0.083…0.464]	0.162	0.425	0.489
	O5	0.867	0.000	[−0.288…0.288]	1.000	0.447	0.679
	O6	0.880	0.238	[−0.046…0.523]	0.096	0.442	0.599
2D-M	O1	0.922	0.000	[−0.204…0.204]	1.000	0.316	0.733
	O2	0.965	0.095	[−0.042…0.232]	0.162	0.213	0.871
	O3	0.877	0.000	[−0.249…0.249]	1.000	0.387	0.612
	O4	0.907	0.000	[−0.204…0.204]	1.000	0.316	0.726
	O5	0.925	−0.143	[−0.360…0.075]	0.186	0.338	0.673
	O6	0.945	0.190	[0.007…0.374]	0.042	0.285	0.732
3D-M	O1	0.876	−0.095	[−0.380…0.189]	0.493	0.442	0.662
	O2	0.958	0.000	[−0.144…0.144]	1.000	0.224	0.872
	O3	0.923	0.095	[−0.103…0.294]	0.329	0.309	0.742
	O4	0.863	0.190	[−0.042…0.423]	0.104	0.362	0.802
	O5	0.975	0.095	[−0.042…0.232]	0.162	0.213	0.865
	O6	0.946	0.190	[0.007…0.374]	0.042	0.285	0.735

Plas-M plaster models, 2D-M 2D digital photographs of plaster models, 3D-M 3D digital models, diff difference, CI confidence interval, DME duplicate measurement error