Table 2.

Normalised and absolute reliability.

	Repeatability		Reproducibility
	OASIS_HC	OASIS_AD	OASIS_HC_TRT	MS
				Philips 3T	Siemens 3T	GE 3T
Normalised difference – median [IQR]
Area	1.40 [0.6–2.7]	1.39 [0.7–2.7]	0.87 [0.2–2.0]	1.11 [0.6–1.9]	0.65 [0.4–2.3]	3.61 [1.7–4.6]
Circularity	1.40 [0.6–2.5]	1.55 [0.6–2.7]	1.06 [0.6–2.3]	1.31 [0.7–2.5]	0.89 [0.5–1.6]	3.04 [2.6–3.3]
Corpus Callosum Index	1.27 [0.6–3.3]	1.44 [0.6–2.7]	1.7 [1.6–6.0]	3.06 [1.4–4.8]	1.02 [0.8–4.9]	1.95 [1.4–3.1]
Thickness profile	2.64 [1.2–4.8]	2.89 [1.4–5.2]	2.4 [1.1–4.4]	3.32 [1.8–5.0]	2.82 [1.5–5.0 ]	5.68 [3.4–9.1]
Absolute difference – median
Area (mm2)	8.06	6.78	5.85	6.9	3.6	19.2
Circularity (−)	0.003	0.002	0.002	0.002	0.001	0.004
Corpus Callosum Index (−)	0.004	0.004	0.007	0.011	0.004	0.007
Thickness profile (mm)	0.14	0.12	0.14	0.14	0.12	0.24

Median of the normalised (%) and absolute difference for the different features in the different datasets. IQR = Inter Quartile Range. For every streamline of the thickness profile, the median (normalised or absolute) was calculated. Next, those results were averaged over all streamlines.