Table 1.
Age and age-adjusted characteristics among controls (N=734) according to CSF1 levels, Nurses' Health Study (1992–1998).
| Q1 (N=184) | Q2 (N=183) | Q3 (N=184) | Q4 (N=183) | |
|---|---|---|---|---|
| Median (pg/ml) | 359.5 | 487.9 | 602.9 | 832.2 |
| Range (pg/ml) | (169.7–424.8) | (425.1–540.5) | (540.9–689.4) | (692.6–2078.7) |
| Means | ||||
| Age, y | 56.3 | 56.9 | 58.3 | 56.2 |
| Age at menarche, y | 12.6 | 12.8 | 12.6 | 12.6 |
| Age at first birth1, y | 25.0 | 24.8 | 25.1 | 24.6 |
| Age at menopause2, y | 48.2 | 47.7 | 46.8 | 47.1 |
| Parity1 | 2.8 | 3.1 | 2.9 | 3.0 |
| BMI, kg/m2 | 24.6 | 24.8 | 25.5 | 26.4 |
| BMI at 18, kg/m2 | 21.2 | 21.1 | 21.5 | 21.4 |
| Weight gain since 18, kg | 8.9 | 10.0 | 11.1 | 13.5 |
| Alcohol, g | 6.4 | 5.8 | 4.7 | 3.6 |
| Frequency, % | ||||
| Premenopausal | 24.5 | 23.2 | 22.0 | 20.7 |
| Family history of BC | 13.8 | 14.5 | 15.2 | 15.7 |
| Prior benign breast disease | 56.6 | 51.2 | 51.2 | 53.9 |
| Nulliparous | 10.1 | 6.7 | 9.1 | 4.1 |
| Current PMH users2 | 59.5 | 53.2 | 59.1 | 61.1 |
| Not current PMH users2 | 40.5 | 46.8 | 40.9 | 38.9 |
| Never PMH users2 | 28.7 | 29.0 | 29.2 | 23.0 |
1
Among parous women only.
2
Among postmenopausal women only.