Table 3. Association between types of lesions on sonograms and prognostic factors.

Type of lesion on sonogram and prognostic factor	Number (%)	OR	95% CI	p-value
Extensive intraductal component				<0.001*
Oval masses without calcifications	49/280 (18)	Reference	NA
Oval masses with calcifications	23/48 (48)	4.34	2.28, 8.26	<0.001*
Irregular masses without calcifications	59/260 (23)	1.38	0.91, 2.11	0.133
Irregular masses with calcifications	66/119 (55)	5.87	3.65, 9.44	<0.001*
Calcifications alone	7/8 (88)	33.00	3.97, 274.34	0.001*
Positive HER-2/neu status				<0.001*
Oval masses without calcifications	45/280 (16)	Reference	NA
Oval masses with calcifications	22/48 (46)	4.42	2.30, 8.48	<0.001*
Irregular masses without calcifications	50/260 (19)	1.24	0.80, 1.94	0.336
Irregular masses with calcifications	46/119 (39)	3.29	2.02, 5.36	<0.001*
Calcifications alone	2/8 (25)	1.74	0.34, 8.90	0.506

NA, not applicable; OR, odds ratio.

^*These were considered to be statistically significant parameters.

Note – Logistic regression analysis was used to evaluate the ORs of the sonographic types for a specific prognostic factor. For the explanatory variables, we have chosen “oval masses without calcifications” as the reference for the other sonographic types in order to determine ORs that predict a specific prognostic factor.