Table 1.

Characteristics of the breast cancer cases and control subjects

Variables	Breast cancer cases	Controls
age (year)
< 40	24	19
40-60	64	74
≥ 60	12	7
pre-menopause	57	60
post-menopause body mass index (kg/m2)	43	40
< 20.0	3	21
20.0-24.9	31	21
25.0-29.9	46	42
≥ 30	20	35