| Demographic variable | N (%) |
| Sex | |
| Men | 3 (37.5) |
| Woman | 5 (62.5) |
| Age category (in years) | |
| 25-34 | 1 (12.5) |
| 35-44 | 1 (12.5) |
| 45-54 | 2 (25.0) |
| 55-64 | 3 (37.5) |
| 65-74 | 1 (12.5) |
| Ethnic background | |
| Dutch | 8 (100.0) |
| Other | 0 |
| Health indication | |
| Badly | 1 (12.5) |
| Quit well | 6 (75) |
| Well | 1 (12.5) |
| Psychological health | |
| Badly | 1 (12.5) |
| Quit well | 4 (50.0) |
| Well | 3 (37.5) |
| Education | |
| Non/primary school | 0 |
| GCSE | 2 (25.0) |
| A-level | 3 (37.5) |
| College | 3 (37.5) |
| Other | 0 |