Table 5.

Logistic Regression Model Results

Predictor		β Coefficient	Std. Error	p Value	Estimated OR (95% CI)
Mass density	High	1.88	0.5	0.0002	6.6 (2.5–17.6)
	Iso/low	–	–	–	1.0 (ref)
Mass shape	Irregular	2.3	0.6	<0.0001	10.0 (3.4–29.5)
	All others	–	–	–	1.0 (ref)
Mass margin	Spiculated	3.01	1.22	0.01	20.4 (1.9–222.8)
	All others	–	–	–	1.0 (ref)

(ref) signifies the reference level in the odds ratio calculation