Table 4. Multiple Linear Regression Analysis of Association of Variables with Distance from the Chest Wall.

	Unstandardized Coefficients		Standardized β Coefficient	P value
Parameters	β	Standard Error
Absolute y-axis distance
Age	0.027	0.007	0.150	< .0001
Family history of breast cancer	0.203	0.250	0.024	.418
Mammographic density	−0.511	0.082	−0.228	< .0001
Triple-negative breast cancer	−0.167	0.075	−0.073	.026
Tumor size	−0.062	0.045	−0.042	.170
Histologic grade	−0.085	0.070	−0.039	.228
Axillary nodal status	0.376	0.137	0.085	0.006
Normalized y-axis distance
Age	0.002	0.001	0.122	.001
Family history of breast cancer	0.020	0.024	0.025	.415
Mammographic density	−0.038	0.008	−0.175	< .0001
Triple-negative breast cancer	−0.016	0.007	−0.073	.028
Tumor size	−0.009	0.004	−0.061	.049
Histologic grade	−0.009	0.007	−0.046	.172
Axillary nodal status	0.047	0.013	0.112	< .0001