Table 1 Characteristics of breast cancer cases and controls.
From: Reduction in the risk of human breast cancer by selective cyclooxygenase-2 (COX-2) inhibitors
Characteristic a | Cases (N = 323) | Controls (N = 649) |
|---|---|---|
Age (yrs) | ||
<50 | 21% | 22 % |
50–65 | 55 | 56 |
>65 | 24 | 22 |
Mean (SEM) | 54.2 (0.7) | 53.3 (0.4) |
Race | ||
Caucasian | 91 % | 89 % |
All Other | 9 | 11 |
Education | ||
< 12 yrs | 12 % | 12 % |
12 yrs | 53 | 55 |
> 12 yrs | 31 | 33 |
Parity | ||
Nulliparous | 6 % | 4 % |
First Pregnancy <30 yrs | 83 | 89 |
First Pregnancy >30 yrs | 11 | 7 (p < 0.05) |
Family History | ||
Positive | 29 % | 16 % |
Negative | 71 | 84 (p < 0.01) |
Body Mass | ||
BMI < 22 | 23 % | 21 % |
BMI 22–28 | 35 | 39 |
BMI > 28 | 42 | 40 |
Mean (SEM) | 27.5 (0.9) | 27.1 (0.7) |
Menopausal Status | ||
Premenopausal | 41 % | 47 % |
Postmenopausal | 59 | 53 (p < 0.05) |
Postmenopausal ERT | 38 | 31 (p < 0.05) |
Smoking | ||
Never smoker | 45 % | 40 % |
Ex-smoker | 38 | 40 |
Current smoker | 27 | 20 (p < 0.02) |
Alcohol Intake | ||
None | 47 % | 45 % |
1–2 drinks per week | 36 | 35 |
> 2 drinks per week | 17 | 20 |