Observed number of women with breast cancer and prior abortion, expected number, O/E and its 95% confidence interval: subgroups defined by social class
| Obs | Exp* | O/E* | 95% CI | |
|---|---|---|---|---|
| *After stratification for age, year of diagnosis, place of residence. | ||||
| Abortion, all | ||||
| Social class | ||||
| 1 | 34 | 32.1 | 1.1 | 0.7 to 1.5 |
| 2 | 122 | 160.8 | 0.8 | 0.6 to 0.9 |
| 3 | 188 | 279.7 | 0.7 | 0.6 to 0.8 |
| 4 | 70 | 89.3 | 0.8 | 0.6 to 1.0 |
| 5 | 19 | 21.0 | 0.9 | 0.5 to 1.4 |
| Unrecorded | 131 | 128.9 | 1.0 | 0.9 to 1.2 |
| Abortion, coded as induced | ||||
| Social class | ||||
| 1 | 10 | 13.8 | 0.7 | 0.4 to 1.3 |
| 2 | 69 | 93.6 | 0.7 | 0.6 to 0.9 |
| 3 | 103 | 165.2 | 0.6 | 0.5 to 0.8 |
| 4 | 41 | 57.9 | 0.7 | 0.5 to 1.0 |
| 5 | 11 | 16.0 | 0.7 | 0.3 to 1.2 |
| Unrecorded | 66 | 66.0 | 1.0 | 0.8 to 1.3 |