Table 3.

The logistic regression coefficients and p values

Metric	Parameter	Coefficient	95% CI		P-value
Single parameter	(a) D10cm3	1.26	−0.01	2.53	0.05
	constant	−0.32	−1.25	0.62
	(b) V52.5CGE	1.46	0.04	2.88	0.04
	constant	−0.19	− 1.16	0.78
Two-parameter metric 1 (c)	breast volume	−0.88	−2.00	0.24	0.14
	D10cm3	1.53	0.17	2.89	0.03
	constant	−0.40	−1.41	0.60
Two-parameter metric 2 (d)	breast volume	−0.80	−1.97	0.37	0.16
	V52.5 CGE	1.65	0.26	3.04	0.02
	constant	−0.31	−1.35	0.74
Two-parameter metric 3 (e)	history of smoking	1.12	0	2.24	0.05
	D10cm3	1.14	−0.07	2.35	0.06
	constant	−0.52	−1.65	0.60
Two-parameter metric 4 (f)	history of smoking	1.18	0	2.35	0.05
	V52.5 CGE	1.27	−0.10	2.64	0.07
	constant	−0.48	−1.65	0.70

Significant p-values are indicated in bold. The dose and volume parameters are related to skin5mm

Abbreviations: CGE cobalt gray equivalent, CI confidence interval