Table 1 Characteristics of breast cancer controls in the Asian-American Breast Cancer Study by menopausal status
From: Green tea intake is associated with urinary estrogen profiles in Japanese-American women
|  | Premenopausal women in luteal phase (n = 119) | Postmenopausal women (n = 72) | ||
|---|---|---|---|---|
| Â | mean | s.d. | mean | s.d. |
Age (y)* | 41.2 | 5.4 | 53.0 | 3.4 |
Body Mass Index (kg / m 2 ) | 21.7 | 3.5 | 21.7 | 2.5 |
| Â | n | column % | n | column % |
Study center, n(%) | Â | Â | Â | Â |
Hawaii | 79 | 66.4% | 48 | 66.7% |
Los Angeles | 19 | 16.0% | 13 | 18.1% |
San Francisco | 21 | 17.6% | 11 | 15.3% |
Combined parity and age at first birth, n(%) | Â | Â | Â | Â |
Nulliparous | 17 | 14.3% | 11 | 15.3% |
1st birth age ≤ 20 y | 7 | 5.9% | 4 | 5.6% |
1-2 live births / age ≥ 21 | 73 | 61.3% | 28 | 38.9% |
3+ live births / age ≥ 21 | 22 | 18.5% | 29 | 40.3% |
Age at menarche, n(%) | Â | Â | Â | Â |
≤ 12 y | 72 | 60.5% | 30 | 41.7% |
> 12 y | 47 | 39.5% | 42 | 58.3% |
Born in Asia, n (%) | Â | Â | Â | Â |
No | 93 | 78.2% | 57 | 79.2% |
Yes | 26 | 21.8% | 15 | 20.8% |
Soy intake (frequency of weekly intake), n (%) | Â | Â | Â | Â |
0-0.5 | 35 | 29.4% | 12 | 16.7% |
0.5 – 1.0 | 35 | 29.4% | 22 | 30.6% |
> 1.0 | 49 | 41.2% | 38 | 52.8% |
Green tea (frequency of weekly intake), n (%) | Â | Â | Â | Â |
<once weekly | 62 | 52.1% | 25 | 34.7% |
1-6 times weekly | 32 | 26.9% | 23 | 31.9% |
7+ times weekly | 25 | 21.0% | 24 | 33.3% |
Black tea (frequency of weekly intake), n (%) | Â | Â | Â | Â |
<once weekly | 85 | 71.4% | 51 | 70.8% |
1-6 times weekly | 21 | 17.6% | 16 | 22.2% |
7+ times weekly | 13 | 10.9% | 5 | 6.9% |
Coffee (frequency of weekly intake), n (%) | Â | Â | Â | Â |
0-2 times weekly | 30 | 25.2% | 11 | 15.3% |
3-13 times weekly | 39 | 32.8% | 22 | 30.6% |
≥14 times weekly | 50 | 42.0% | 39 | 54.2% |
Estimated weekly caffeine intake (mg), n (%) | Â | Â | Â | Â |
0-734 | 41 | 34.5% | 23 | 31.9% |
734-1610 | 39 | 32.8% | 23 | 31.9% |
>1610 | 39 | 32.8% | 26 | 36.1% |