Table 2

Baseline patient characteristics before and after propensity score matching (numerical variables)

Numerical variables	Before matching			After matching
Numerical variables	Implant (n = 288) mean ± SD	Autologous (n = 331) mean ± SD	P value	Implant (n = 183) mean ± SD	Autologous (n = 183) mean ± SD	P value
Age (years)	38.4 ± 0.5	41.7 ± 0.4	<0.0001^†,*	39.6 ± 0.6	39.6 ± 0.5	0.92^φ
BMI (kg/m²)	22.4 ± 0.1	23.3 ± 0.2	<0.0001^†,*	22.8 ± 0.2	22.9 ± 0.2	0.61^†
Positive nodes	0.9 ± 0.1	2.5 ± 0.3	<0.0001^†,*	1.4 ± 0.2	1.8 ± 0.3	0.47^†
Total nodes	16.2 ± 0.5	20.0 ± 0.4	<0.0001^†,*	18.1 ± 0.6	19.0 ± 0.5	0.15^†
Number of 2^nd surgery	0.1 ± 0.0	0.1 ± 0.0	0.49^†	0.1 ± 0.0	0.1 ± 0.0	0.83^†
Number of lipo-filling	0.0 ± 0.0	0.0 ± 0.0	0.17^†	0.0 ± 0.0	0.0 ± 0.0	0.66^†

Secondary surgery refers to revision or salvage surgery that was not associated with tumor relapse. ^†Wilcoxon rank sum test. ^φWelch 2-sample t test. *P < 0.05.