TABLE 2.

Inter-approach and inter-observer distances between contours at different cranio-caudal levels of the HR CTV

	Inter-contour distance [mm] (mean (SD))	Limits of agreement [mm]	95% CI [mm]
	All slices
Inter-approach analysis
Observer 1	2.6 (0.4)	1.8, 3.4	1.3, 3.8
Observer 2	2.8 (0.7)	1.5, 4.2	0.8, 4.9
Inter-observer analysis
Conventional approach	3.1 (0.8)	1.5, 4.7	0.8, 5.5
Test approach	3.0 (0.7)	1.5, 4.5	0.8, 5.2
	Caudal two slices
Inter-approach analysis
Observer 1	3.5 (1.5)	0.5, 6.5	−1.0, 8.0
Observer 2	3.7 (2.1)	−0.5, 8.0	−2.6, 10.1
Inter-observer analysis
Conventional approach	5.4 (3.1)	−0.9, 11.7	−4.0, 14.9
Test approach	4.4 (3.0)	−1.7, 10.5	−4.7, 13.5
	Middle slices
Inter-approach analysis
Observer 1	2.4 (0.3)	1.7, 3.0	1.7, 3.3
Observer 2	2.8 (0.9)	0.9, 4.7	0.0, 5.6
Inter-observer analysis
Conventional approach	2.6 (0.4)	1.7, 3.5	1.3, 3.9
Test approach	2.5 (0.7)	1.1, 4.0	0.4, 4.7
	Cranial two slices
Inter-approach analysis
Observer 1	2.1 (0.5)	1.1, 3.2	0.6, 3.7
Observer 2	2.4 (0.8)	0.7, 4.1	−0.1, 4.9
Inter-observer analysis
Conventional approach	2.5 (1.0)	0.5, 4.5	−0.5, 5.5
Test approach	2.7 (0.7)	1.3, 4.0	0.6, 4.7

SD = standard deviation of differences; 95% CI = limits of 95% confidence interval for lower and upper limit.