Table 2.
Donor characteristics by breast sample phenotype
| Characteristic | Active | Inactive | p valuea |
|---|---|---|---|
| N = 78 | N = 73 | ||
| Age at biopsy (years) | .01 | ||
| Mean | 47.13 | 42.25 | |
| Age at menarche (years) | .06 | ||
| Mean | 12.78 | 12.32 | |
| Parity (live births) | .13 | ||
| Mean | 2.01 | 2.22 | |
| Age at first birth (years) | .95 | ||
| Mean | 26.89 | 26.92 | |
| BMI (kg/m2) | .75 | ||
| Mean | 29.80 | 29.41 | |
| Family historyb | .54 | ||
| Percent positive | 25.6% | 23.3% | |
| Gail 5 year risk scores | .01 | ||
| Mean | 1.46% | 1.18% |
ap value is the chi-squared p value for difference in means between samples
bAt least one first-degree relative with breast cancer