Table 5. Summary of multiple linear regression analysis.

Variables	β	SE	stdβ	t	P
Age	0.001	0.000	0.345	2.522	0.015*
Capsular contracture	−0.011	0.005	−0.252	−2.093	0.041*
Radiotherapy	−0.006	0.006	−0.123	−0.906	0.369
Follow up	−0.001	0.000	−0.196	−1.662	0.103

R²=0.339, adjusted R² =0.298, P<0.001. *, P<0.05. R², coefficient for determination. β, partial regression coefficient; SE, standard error; stdβ, standardized partial regression coefficient.