4. Clinicopathological correlations of bilateral breast cancer.

Left vs. Right	r (95% CI)	P
95% CI, 95% confidence interval.
Histological type (n=371)	0.259 (0.159−0.355)	<0.001
Malignancy grade (n=328)	0.452 (0.359−0.537)	<0.001
Tumor location (n=309)	0.210 (0.098−0.318)	<0.001
Molecular subtype (n=326)	0.477 (0.386−0.559)	<0.001
Ki-67 index (n=307)	0.283 (0.173−0.386)	<0.001
Tumor site (n=309)	0.192 (0.079−0.300)	0.001
Tumor size (n=321)	0.250 (0.141−0.353)	<0.001