Table 3. Relationship between patient age for 339 patients with invasive ductal carcinoma of the breast and GRB7 expression.

GRB7	N	Mean age	Median age	StdDev	Min	Max	95% CI (for mean)
0–1+	210a	49.99	48	11.83	18	86	(48.38–51.59)
2+–3+	128	48.23	49	10.58	27	73	(46.39–50.08)
Total	338	49.32	49	11.39	18	86	(48.10–50.54)

GRB7 protein expression levels in the cytoplasm is shown as low (no staining to weak staining, 0 to 1+) vs. high (medium to strong staining, 2+ to 3+). (a) One data point was removed due to missing age information (for GRB7–1+).