Table 3.

Multivariate Analysis to Determine Factors Associated with RID

Variable	HR	95% CI	P value
Surgery type
Mastectomy	Ref
BCS	0.323	0.19–0.54	<0.001*
Nodal irradiation
Yes	Ref
No	0.811	0.60–1.1	0.18
BMI
≤24	Ref
>24	1.44	0.78–2.63	0.24
RT technique
3D-CRT	Ref
IMRT	0.27	0.14–0.50	<0.001*

Note: *Statistical significance.