Table 4.

Intra-observer performance (six observers, O1 to O6) for the palatal morphology (PM) component of the EUROCRAN index

	Observer	Reliability	Mean diff.	95 % CI of mean diff	p Value	DME	Kappa
Plas-M	O1	0.014	0.048	[−0.221…0.316]	0.715	0.417	0.013
	O2	0.315	0.048	[−0.221…0.316]	0.715	0.417	0.246
	O3	0.333	0.000	[−0.288…0.288]	1.000	0.447	0.257
	O4	0.672	0.095	[−0.103…0.294]	0.329	0.309	0.600
	O5	0.833	0.048	[−0.127…0.223]	0.576	0.272	0.755
	O6	0.258	0.143	[−0.155…0.441]	0.329	0.463	0.074
2D-M	O1	0.200	−0.143	[−0.360…0.075]	0.186	0.338	0.173
	O2	0.447	0.381	[0.154…0.607]	0.002	0.352	0.333
	O3	−0.069	0.286	[−0.041…0.612]	0.083	0.507	−0.059
	O4	0.414	0.286	[0.075…0.496]	0.010	0.327	0.292
	O5	0.408	0.095	[−0.150…0.341]	0.428	0.381	0.400
	O6	0.636	−0.048	[−0.223…0.127]	0.576	0.272	0.632
3D-M	O1	0.315	0.048	[−0.221…0.316]	0.715	0.417	0.125
	O2	0.395	0.429	[0.198…0.659]	0.001	0.359	0.270
	O3	0.408	0.238	[−0.007…0.483]	0.056	0.381	0.364
	O4	0.400	0.190	[0.007…0.374]	0.042	0.285	0.276
	O5	0.485	−0.048	[−0.274…0.179]	0.666	0.352	0.483
	O6	0.614	0.190	[−0.083…0.464]	0.162	0.425	0.317

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