Table 1.

Mean values (± standard deviation, SD) for measurements and intra- and interobserver reliabilities expressed as ICCs (intraclass correlation coefficient). Statistically significant p-values are shown in italics. p < 0.05 are classed as statistically significant and ≥ 0.05 as not significant. R1, 2; rater 1 and 2; M1, 2; measurement 1 and 2. CI; confidence interval

Comparison	Variable 1		Mean ± SD	Variable 2		Mean ± SD	Mean diff. ± SD	p	ICC	95% CI
Intrarater R1	Kanekasu	Surg. M1	− 1.6; 2.78	Kanekasu	Surg. M2	− 1.9; 2.93	0.31; 2.13	0.199	0.721	0.599 – 0.811
		Anat. M1	2.65; 2.84		Anat. M2	2.96; 3.01	− 0.32; 1.6	0.077	0.850	0.777–0.901
	2D-CT	Surg. M1	− 0.45; 2.56	2D-CT	Surg. M2	− 0.46; 2.77	0.01; 1.34	0.934	0.874	0.811–0.917
		Anat. M1	2.96; 2.9		Anat. M2	3.15; 2.79	− 0.18; 1.14	0.148	0.920	0.879- 0 .948
Intrarater R2	Kanekasu	Surg. M1	− 1.72; 2.57	Kanekasu	Surg. M2	− 1.89; 2.33	0.17; 0.97	0.113	0.923	0.882–0.949
		Anat. M1	3.29; 2.52		Anat. M2	3.02; 2.49	0.27; 1.1	0.030	0.904	0.854–0.937
	2D-CT	Surg. M1	− 1.22; 2.39	2D-CT	Surg. M2	− 1.43; 2.46	0.21; 1.3	0.153	0.856	0.785–0.904
		Anat. M1	3.07; 2.5		Anat. M2	2.9; 2.63	0.17; 1.39	0.268	0.854	0.783–0.903
Interrater	Kanekasu	Surg. R1	− 1.75; 2.65	Kanekasu	Surg. R2	− 1.81; 2.41	0.05; 1.52	0.744	0.820	0.734–0.880
		Anat. R1	2.81; 2.82		Anat. R2	3.16; 2.44	− 0.35; 1.46	0.031	0.846	0.771–0.898
	2D-CT	Surg. R1	− 0.46; 2.58	2D-CT	Surg. R2	− 1.32; 2.34	0.87; 1.21	0.000	0.878	0.817–0.920
		Anat. R1	3.06; 2.79		Anat. R2	2.99; 2.47	0.07; 1.17	0.605	0.901	0.851–0.935
Surg. vs. anat.	Kanekasu	Surg.	− 1.78; 2.41	Kanekasu	Anat.	2.98; 2.53	− 4.76; 1.07	0.000	0.907	0.859–0.939
	2D-CT	Surg.	− 0.89; 2.39	2D-CT	Anat.	3.02; 2.57	− 3.91; 0.82	0.000	0.946	0.917–0.965
Kanekasu vs. 2D-CT	Kanekasu	Surg.	− 1.78; 2.41	2D-CT	Surg.	− 0.89; 2.39	− 0.89; 1.76	0.000	0.731	0.611–0.818
		Anat.	2.98; 2.53		Anat.	3.02; 2.57	− 0.04; 1.77	0.839	0.760	0.651–0.838
With 3D-CT total	Kanekasu	Surg.	− 1.78; 2.41	3D-CT	Anat.	3.15; 2.93	− 4.92; 2.71	0.000	0.489	0.305–0.638
		Anat.	2.98; 2.53				− 0.16; 2.4	0.537	0.614	0.459–0.733
	2D-CT	Surg.	− 0.89; 2.39				− 4.04; 1.95	0.000	0.733	0.615–0.820
		Anat.	3.02; 2.57				− 0.13; 1.65	0.494	0.821	0.736–0.881