|
Characteristic
|
Cases (n = 237)
|
Controls (n = 185)
|
Chi-square
|
P value
|
|---|
|
Age *
| | | | |
|
< 45 years
|
53
|
38
| | |
|
≥ 45 years
|
184
|
147
|
0.20
|
0.65
|
|
Body mass index
| | | | |
|
< 22 kg/m2
|
126
|
99
| | |
|
≥ 22 kg/m2
|
111
|
86
|
0.005
|
0.94
|
|
Age at menarche
| | | | |
|
< 14 years
|
113
|
92
| | |
|
≥ 14 years
|
124
|
93
|
0.17
|
0.68
|
|
Age at first birth
| | | | |
|
< 25 years
|
96
|
67
| | |
|
≥ 25 years
|
112
|
98
| | |
|
No birth
|
29
|
20
|
1.36
|
0.51
|
|
Number of births
| | | | |
|
< 2
|
56
|
43
| | |
|
≥ 2
|
181
|
142
|
0.009
|
0.93
|
|
Menopause state
| | | | |
|
Premenopause
|
134
|
71
| | |
|
Postmenopause
|
103
|
114
|
13.72
|
< 0.001
|
|
Alcohol
| | | | |
|
< 1 day/week
|
184
|
148
| | |
|
≥ 1 day/week
|
53
|
37
|
0.35
|
0.56
|
|
Smoking
| | | | |
|
Noncurrent
|
211
|
169
| | |
|
Current
|
26
|
16
|
0.63
|
0.43
|
|
Family history of breast cancer (mother and /or sisters)
| | | | |
|
No
|
207
|
173
| | |
|
Yes
|
30
|
12
|
4.42
|
0.04
|
-
* Age at diagnosis for cases and at study enrollment for controls.
