Table 1.
Distribution of 3034 cases of breast cancer and 3392 controls according to selected characteristics. Italy and Switzerland, 1991–2008.
| Characteristic | Cases | Controls |
|---|---|---|
| n (%) | n (%) | |
| Centre | ||
| Pordenone/Gorizia | 1046 (34.5) | 1015 (29.9) |
| Milan | 585 (19.3) | 623 (18.4) |
| Genoa | 290 (9.6) | 310 (9.1) |
| Forlì | 212 (7.0) | 213 (6.3) |
| Naples | 258 (8.5) | 249 (7.3) |
| Rome/Latina | 178 (5.9) | 178 (5.3) |
| Switzerland | 465 (15.3) | 804 (23.7) |
| Age group | ||
| <45 | 562 (18.5) | 686 (20.2) |
| 45–54 | 898 (29.6) | 870 (25.7) |
| 55–64 | 912 (30.1) | 978 (28.8) |
| ≥65 | 662 (21.8) | 858 (25.3) |
| Menopausal status a | ||
| Premenopause | 1150 (38.0) | 1180 (34.8) |
| Postmenopause | 1880 (62.1) | 2212 (65.2) |
| Education (years) a | ||
| <7 | 1273 (42.2) | 1583 (47.0) |
| 7–11 | 972 (32.2) | 1120 (33.2) |
| ≥12 | 775 (25.7) | 666 (19.8) |
| Parity a | ||
| Nulliparae | 504 (16.6) | 597 (17.6) |
| 1 | 676 (22.3) | 688 (20.3) |
| 2 | 1163 (38.4) | 1179 (34.8) |
| ≥3 | 688 (22.7) | 926 (27.3) |
| Family history of breast cancer in first-degree relatives | ||
| No | 2724 (89.8) | 3249 (95.8) |
| Yes | 310 (10.2) | 143 (4.2) |
a The sum does not add up to the total because of missing values.