Table 1.
Frequencies (percentages) of different social classes of mother’s husband, and mother’s father, in the case and control groups, and in women meeting the inclusion criteria from the NCDS cohort as a whole
| Class category | Whole cohort | Cases and controls |
|---|---|---|
| Mother’s husband | ||
| I | 229 (4.4) | 3 (0.5) |
| II | 687 (13.3) | 35 (5.8) |
| III | 3010 (58.4) | 346 (57.8) |
| IV | 601 (11.7) | 105 (17.5) |
| V | 409 (7.9) | 70 (11.7) |
| Students | 4 (0.1) | 0 (0) |
| Single, dead, away | 114 (2.2) | 25 (4.2) |
| Retired | 1 (0.01) | 0 (0) |
| Missing data | 97 (1.9) | 15 (2.5) |
| Mother’s father | ||
| I | 115 (2.2) | 3 (0.5) |
| II | 673 (13.1) | 47 (7.9) |
| III | 2266 (44.0) | 236 (39.4) |
| IV | 633 (12.3) | 103 (17.2) |
| V | 586 (11.4) | 95 (15.9) |
| Unemployed, sick | 36 (0.7) | 3 (0.5) |
| Dead, away | 394 (7.7) | 52 (8.7) |
| Retired | 60 (1.2) | 6 (1.0) |
| Missing data | 289 (7.6) | 54 (9.0) |