Table 8.

Description of phantom grouping for analysis of Spearman's correlation (r_s, p < 0.05) of dose factors and potential factors of influence: spongiosa volume – V_s; spongiosa surface area –SS; bone volume fraction in spongiosa - BV/TV (for DF(AM ← TBV)); cortical thickness – Ct.Th (for DF(AM ← CBV)). δ_geom - the uncertainty associated with stylization of bone geometry within the segment groups. 1d, 2d and 3d are 1 dimension, 2 dimensions and 3 dimensions of the circumscribed box, respectively.

Group	Group description	N	rs				δgeom, %
DF(AM ← TBV)
			Vs	SS	BV/TV	SS × BV/TV
TBV1	3d > 1.1 cm	356	0.025a	0.051a	0.980	–	neglected
TBV2	Vs >1.1 cm3, 1d < 1.1 cm	150	0.389	0.458	0.740	0.893	15
TBV3	Vs >1.1 cm3, 2d < 1.1 cm	116	0.480	0.430	0.654	0.719	13
TBV4	Vs<1.1 cm3	54	0.880	0.874	0.659	0.964	7
DF(AM ← CBV)
			Vs	SS	Ct.Th	Ct.Th/Vs
CBV1	3d > 2.8 cm	47	−0.03a	0.23a	0.953	–	neglected
CBV2	3d > 1.5 cm, but some <2.8 cm.	103	−0.747	−0.399	0.631	0.872	15
CBV3	3d > 1.1 cm, but some <1.5 cm.	206	−0.626	−0.072	0.701	0.861	10
CBV4	1d, 2d or 3d < 1.1; Vs > 1.6 cm3	279	−0.950	−0.689	0.818	0.976	14
CBV5	1d, 2d or 3d < 1.1; 1.6 cm3 >Vs > 0.2 cm3	39	−0.878	−0.866	0.402	0.78	9
CBV6	Vs < 0.2 cm3	26	−0.947	−0.945	0.111	0.949	4

^ap > 0.05.