Body composition determinants of radiation dose during abdominopelvic CT

Insights into Imaging

Table 3 Multiple linear regression analysis with dose length product as dependent and body composition variables as the independent variables summarised according to patient group

Group	All patients (R² = 0.772)		Younger female (R² = 0.861)		Older female (R² = 0.684)		Younger male (R² = 0.758)		Older male (R² = 0.778)
Total adipose tissue (TAT)	0.027	p < 0.001	0.032	p < 0.001	0.017	p < 0.001	−0.029	p < 0.001	9.094	p < 0.001
Muscle volume (MV)	0.022	p < 0.001	0.014	p = 0.180	0.030	p = 0.011	0.017	p = 0.065	3.479	p = 0.001
Bone volume (BV)	0.043	p = 0.145	0.041	p = 0.557	0.091	p = 0.206	−0.031	p = 0.689	0.183	p = 0.855
Liver volume (LV)	0.032	p = 0.157	−0.038	p = 0.402	0.073	p = 0.258	0.050	p = 0.340	1.291	p = 0.201
Right kidney volume (RKV)	−0.141	p = 0.712	−0.617	p = 0.396	−0.119	p = 0.851	2.778	p = 0.477	−0.759	p = 0.451
Left kidney volume (LKV)	0.236	p = 0.562	1.197	p = 0.157	−0.097	p = 0.867	−1.614	p = 0.685	0.135	p = 0.893
Spleen volume (SV)	−0.017	p = 0.680	−0.011	p = 0.849	−0.399	p = 0.207	0.007	p = 0.951	−0.201	p = 0.842

Data presented are unstandardised co-efficient values (B) of the multiple linear regression model. Significance at the 0.05 level