Table 1.

Patient characteristics

Characteristics	No.	%
Age (years)	56 (23–95)
≤ 50	559	32.7
> 50	1151	67.3
Menstrual status
Peri/pre-menopause	597	34.9
Post-menopause	1113	65.1
Breast surgery type
Lumpectomy	504	29.5
Mastectomy	1206	70.5
Tumor size
≤ 2 cm	857	50.1
> 2 cm	848	49.6
NA	5	0.3
Axillary lymph node
Negative	1003	58.7
Positive	702	41.0
NA	5	0.3