Table 1. Distribution of all subjects’ socio-demographic characteristics.

Characteristic	Case			Control		P
	No.	%		No.	%
Age (year)						0.15
<39	26	11.1		14	6.6
40–49	93	39.7		62	29.4
50–59	68	29.1		113	53.6
≥60	47	20.1		22	10.4
Body mass index (kg/m2)						0.04
<20	30	12.8		38	18.0
20–24.9	132	56.4		133	63.0
25–29.9	58	24.8		38	18.0
≥30	14	6.0		2	0.9
First-degree family history of breast cancer						0.03
No	208	88.9		197	93.4
Yes	26	11.1		14	6.6
Age at menarche						0.01
12 or less	23	9.8		13	6.2
13	47	20.1		34	16.1
14	43	18.4		56	26.5
15 or older	121	51.7		108	51.2
Smoking						0.82
Never smoked	213	91.0		189	89.6
Past smoker	14	5.9		15	7.1
Current smoker	7	2.9		7	3.3
Alcohol						0.72
Non-drinker	133	56.8		136	64.5
Past drinker	10	4.2		8	3.8
Current drinker	91	38.8		67	31.8

Results were statistically analyzed with a Chi-square test.