Observed number of women with breast cancer and prior abortion, expected number, O/E and its 95% confidence interval: women aged 30–39 and 40–49 years at time of breast cancer between 1989–98
| Obs | Exp† | O/E† | 95% CI | |
|---|---|---|---|---|
| *Totals as previously published; †after stratification for age, year of diagnosis, place of residence. | ||||
| Abortion, all | ||||
| Aged 30–39 in 1989–98 | 65 | 79.4 | 0.8 | 0.6 to 1.0 |
| Aged 40–49 in 1989–98 | 161 | 188.5 | 0.9 | 0.7 to 1.0 |
| All women* | 564 | 643 | 0.9 | 0.8 to 1.0 |
| Abortion, specified as induced | ||||
| Aged 30–39 in 1989–98 | 32 | 42.4 | 0.8 | 0.5 to 1.1 |
| Aged 40–49 in 1989–98 | 72 | 96.6 | 0.8 | 0.6 to 0.9 |
| All women* | 300 | 363 | 0.8 | 0.7 to 0.9 |