Table 1. Characteristic of study participants.

Characteristics	No. of patients (%)	No. of events (%)	P a	HRb	(95% CI)	P b
Total	107 (100.0)	20 (100.0)
Age (Mean ± SD)	50.6±8.2	52.5±10.6	0.60
<50	54 (50.5)	11 (55.0)		1.00
≥50	53 (49.5)	9 (45.0)		0.79	(0.33–1.91)	0.60
Body mass index (Mean ± SD)	23.7±2.9	24.4±2.13	<0.02
<21.4 (median)	30 (33.3)	1 (5.0)		1.00
≥21.4	77 (66.7)	19 (95.0)		7.30	(0.98–54.61)	0.05
Family history			1.00
No	97 (90.7)	18 (90.0)		1.00
Yes	10 (9.3)	2 (10.0)		1.00	(0.23–4.37)	1.00
Educational level			0.46
≤Middle school	30 (28.3)	4 (20.0)		1.00
High school	46 (43.4)	11 (55.0)		1.95	(0.62–6.13)	0.26
≥College or university	30 (28.3)	5 (25.0)		1.27	(0.34–4.73)	0.72
Menopausal status			0.71
Premenopausal	62 (58.5)	11 (55.0)		1.00
Postmenopausal	44 (41.5)	9 (45.0)		1.18	(0.49–2.84)	0.72
Smoking status			0.10
Never	100 (93.5)	17 (85.0)
Ever	7 (6.5)	3 (15.0)		2.70	(0.78–9.17)	0.12
Alcohol consumption			0.66
Never	70 (65.4)	14 (70.0)
Ever	37 (34.6)	6 (30.0)		0.81	(0.31–2.10)	0.66
Estrogen receptor status			0.07
Positive	66 (62.3)	9 (45.0)		1.00
Negative	40 (37.7)	11 (55.0)		2.19	(0.90–5.28)	0.08
Progesterone receptor status			0.01
Positive	53 (50.5)	5 (25.0)		1.00
Negative	52 (49.5)	15 (75.0)		3.39	(1.23–9.37)	0.02
TNM stage			<0.01
0/I	48 (45.3)	4 (20.0)		1.00
II	40 (37.7)	7 (35.0)		2.20	(0.64–7.56)	0.21
III	18 (17.0)	9 (50.0)		8.54	(2.62–27.88)	<0.01

^aLog rank test.

^bUnivariate Cox-proportional hazard model.