Table 1.
Baseline characteristics of the UKCTOCS cohort
| Number of women | Per cent | |
|---|---|---|
| Birth cohort | ||
| 1925 to 1929 | 2588 | 1.3 |
| 1930 to 1934 | 26 201 | 12.9 |
| 1935 to 1939 | 41 418 | 20.4 |
| 1940 to 1944 | 51 057 | 25.2 |
| 1945 to 1949 | 55 510 | 27.4 |
| 1950 to 1955* | 25 863 | 12.8 |
| Ethnicity | ||
| Caucasian | 195 275 | 96.4 |
| Black | 2769 | 1.4 |
| Asian | 1856 | 0.9 |
| Other | 1695 | 0.8 |
| Missing data | 1043 | 0.5 |
| Cancer history | ||
| Personal history of cancer | 12 060 | 6.0 |
| Breast | 7652 | 3.8 |
| Bowel | 760 | 0.4 |
| Lung | 100 | 0.1 |
| Other | 3548 | 1.8 |
| Maternal history of cancer | ||
| Maternal history of breast/ovarian cancer | 16 025 | 7.9 |
| Breast | 12 990 | 6.4 |
| Ovarian | 3162 | 1.5 |
| Both | 127 | 0.1 |
| Family history of breast or ovarian cancer | ||
| Family history of ovarian cancer | 9184 | 4.5 |
| Number of relatives with ovarian cancer | ||
| 1 | 9028 | 0.1 |
| 2 | 142 | 0.1 |
| >2 | 14 | 0 |
| Family history of breast cancer | 45 010 | 22.2 |
| Number of relatives with breast cancer | ||
| 1 | 36 965 | 18.2 |
| 2 | 6460 | 3.2 |
| >2 | 1585 | 0.8 |
| BMI | ||
| Underweight (<18.5) | 1874 | 0.9 |
| Normal (18.5–24.9) | 83 062 | 41 |
| Overweight (25.0–29.9) | 74 283 | 36.7 |
| Obese (>30) | 41 236 | 20.3 |
| Education† | ||
| College/University or equivalent | 29 428 | 20.2 |
| Other formal education | 69 862 | 48.4 |
| No formal educational qualification | 41 666 | 28.8 |
| Missing data | 3498 | 2.4 |
*Includes 370 women born in 1955
†Subcohort analysis of 144 454 from a follow-up questionnaire
BMI, body mass index; UKCTOCS, UK Collaborative Trial of Ovarian Cancer Screening.