Table 5. Multivariate logistic regression analysis in 331 patients with invasive ductal carcinoma of the breast using GRB7 cytoplasmic expression (low 0 - 1+ vs. high 2+ - 3+) as the response variable.

		95% Confidence interval
Effect	Odds ratio	Lower	Upper	p-value
Age (<50 vs. ≥50)	1.057	0.691	1.619	0.7975
Tumor size (<2 vs. ≥2)	0.972	0.618	1.526	0.9004
Nodes (N vs. P)	1.113	0.413	2.999	0.8321
HER-2 (N vs. P)	20.106	11.574	34.928	<0.0001
HER-2 (Equiv vs. P)	3.929	1.792	8.615	0.0006
ER (N vs. P)	1.174	0.699	1.971	0.5445
PR (N vs. P)	0.550	0.317	0.952	0.0326

N = negative, P = positive, Equiv = equivocal. Not all data points were available for all patients. Due to the missing, total of 331 (not 339) were used for multivariate logistic model.