Table 4.

Multivariate Cox proportional hazard models for predicting distant disease-free survival of late recurrence after propensity score matching.

Characteristics	Multivariate analysis
	HR (95 % CI)	P value
Age, years	1.01 (0.95–1.06)	0.711
Menopausal status (postmenopausal)	1.32 (0.44–3.96)	0.615
Tumor size >2 cm	2.24 (1.25–4.02)	0.0064
Lymph node involvement	1.52 (1.02–2.27)	0.035
High grade	1.91 (1.05–3.45)	0.032
Extended endocrine therapy	0.27(0.11–0.68)	0.0054

HR, hazard ratio; CI, confidence interval.