Demographic characteristics of first-degree relatives (N=289)
| Frequency (%) | ||
| Gender | Male | 80 (27.7) |
| Female | 209 (72.3) | |
| Age | 18–29 | 23 (8.0) |
| 30–39 | 45 (15.6) | |
| 40–49 | 75 (26.0) | |
| 50–59 | 86 (29.8) | |
| 60–69 | 47 (16.3) | |
| 70 and over | 13 (4.5) | |
| Ethnicity | Asian | 10 (3.5) |
| Black African Caribbean | 1 (0.3) | |
| White | 271 (93.8) | |
| Other | 7 (2.4) | |
| Highest level of education | None | 1 (0.3) |
| Primary school | 0 | |
| Secondary school | 41 (14.2) | |
| Sixth form | 48 (16.6) | |
| Degree or vocational | 123 (42.6) | |
| Postgraduate | 72 (24.9) | |
| Other | 4 (1.4) | |
| Employment | Employed part-time | 51 (17.8) |
| Employed full-time | 135 (46.7) | |
| Self-employed part-time | 16 (5.5) | |
| Self-employed full-time | 18 (6.2) | |
| Student part-time | 0 | |
| Student full-time | 12 (4.2) | |
| Home maker | 5 (1.7) | |
| Unemployed | 3 (1.0) | |
| Not working due to disability | 5 (1.7) | |
| Retired | 44 (15.2) | |
| Other | 6 (2.1) | |