Table 1. Characteristics of the 9044 women by breast cancer case status.
| Cases ( n =573) | Controls ( n =8471) | Total ( n =9044) | |
|---|---|---|---|
| Age at baseline (median, interquartile range) | 55 (48–62) | 53 (47–60) | 54 (47–61) |
| Right 2D : 4D (mean, standard deviation) | 0.961 (0.038) | 0.961 (0.037) | 0.961 (0.037) |
| Left 2D : 4D (mean, standard deviation) | 0.969 (0.037) | 0.966 (0.036) | 0.966 (0.036) |
| Δr−l 2D : 4D (mean, standard deviation) | −0.008 (0.033) | −0.005 (0.034) | −0.005 (0.034) |
| Age at menopause (median, interquartile range) | 50 (48–53) | 50 (47–52) | 50 (47–52) |
| Age at menarche (n, %) | |||
| <12 | 99 (17) | 1378 (16) | 1477 (16) |
| 12 | 118 (20) | 1651 (20) | 1769 (20) |
| 13 | 150 (26) | 2295 (27) | 2445 (27) |
| ⩾14 | 204 (36) | 3128 (37) | 3332 (37) |
| Country of birth (n, %) | |||
| Australia, New Zealand, United Kingdom | 491 (86) | 6303 (74) | 6794 (75) |
| Italy | 57 (10) | 1355 (16) | 1412 (16) |
| Greece | 25 (4) | 813 (10) | 838 (9) |