Table 4. Stratified analysis with respect to age for correlation between tumor location and stage of tumor among females with breast cancer (n = 290).

* P-value < 0.001.

Age groups	Tumor location	Stage of tumor				P-value
		I	II	III	IV‎
<40 years	Upper inner quadrant	2 (66.7%)	4 (28.6%)	3 (6.4%)	1 (4.8%)	0.018*
	Lower inner quadrant	0	5 (35.7%)	6 (12.8%)	3 (14.3%)
	Upper outer quadrant	1 (33.3%)	5 (35.7%)	35 (74.5%)	15 (71.4%)
	Lower outer quadrant	0	0	3 (6.4%)	2 (9.5%)
	Central	0	0	0	0
≥40 years	Upper inner quadrant	0	8 (17%)	10 (8.8%)	2 (4.9%)	0.552
	Lower inner quadrant	1 (25%)	9 (19.1%)	13 (11.5%)	4 (9.8%)
	Upper outer quadrant	3 (75%)	28 (59.6%)	84 (74.3%)	32 (78%)
	Lower outer quadrant	0	2 (4.3%)	4 (3.5%)	2 (4.9%)
	Central	0	0	2 (1.8%)	1 (2.4%)