Table 5.

Bivariate and multivariate logistic regression analysis: odds of malignancy.

	Bivariate			Multivariate
Independent Variables	OR	95% CI	p	OR	95% CI	p
Age (years)	0.987	0.972–1.001	0.073	0.991	0.971–1.011	0.359
Sex (%)			0.637			0.149
Male	1 (ref.)			1 (ref.)
Female	0.872	0.494–1.539		0.578	0.275–1.216
Nodule size (mm)	0.938	0.920–0.957	<0.001	-	-	-
Nodule size (mm)			<0.001			0.001
≥40	1 (ref.)			1 (ref)
≥20–<40	3.579	1.831–6.995	<0.001	3.329	1.284–8.630	0.013
<20	9.26	4.526–18.944	<0.001	6.537	2.352–18.167	<0.001
Echogenicity (%)			0.015	-	-	-
Hyperechoic	1 (ref.)
Isoechoic	0.667	0.153–2.899	0.589
Hypoechoic	2.169	0.582–8.087	0.249
Composition			0.001			0.020
Mixed cystic and solid	1 (ref.)			1 (ref.)
Solid	2.974	1.595–5.546		2.313	1.138–4.701
Margins (%)			<0.001			0.003
Regular	1 (ref.)			1 (ref.)
Irregular	5.786	2.439–13.723		5.655	1.979–16.158
Microcalcifications (%)			0.001	-	-	-
Absent	1 (ref.)
Present	2.892	1.564–5.346

OR: odds ratio.