Table 2.
Hazard ratio of invasive breast cancer and DCIS associated with available risk factors; age, the number of childbirths, whether or not the woman attends the mammography screening program
| Risk factor | Invasive breast cancer | Ductal carcinoma in situ | ||
|---|---|---|---|---|
| Number | HR with 95% CI | Number | HR with 95% CI | |
| Age in 2006 | ||||
| 50–53 | 1039 | 188 | ||
| 54–57 | 1101 | 1.14 (1.04–1.24) | 144 | 0.93 (0.75–1.16) |
| 58–61 | 1313 | 1.34 (1.23–1.45) | 198 | 0.75 (0.60–0.95) |
| 62–65 | 1144 | 1.53 (1.40–1.67) | 151 | 1.00 (0.81–1.24) |
| Childbirth | ||||
| 0 | 836 | 118 | ||
| 1–2 | 2415 | 0.95 (0.87–1.03) | 354 | 1.31 (1.04–1.65) |
| >3 | 1346 | 0.75 (0.68–0.82) | 209 | 1.20 (1.01–1.42) |
| Attending the screening program in 2004–2009 | ||||
| No | 623 | 36 | ||
| Yes | 3890 | 1.15 (1.05–1.24) | 640 | 3.32 (2.37–4.65) |