Characteristics of participants in the first wave in the UK and the Netherlands (2013). Weighted data
| UK | The Netherlands | Between-country differences | |
| (n=768) | (n=1164) | ||
| Gender | |||
| Female (%) | 48.6 | 49.3 | χ2(1)=0.08 |
| P=(0.777) | |||
| Age | |||
| 18–24 years (%) | 11.9 | 12.8 | χ2(3)=4.90 |
| 25–39 years (%) | 27.2 | 23.1 | (P=0.179) |
| 40–54 years (%) | 33.4 | 33.4 | |
| 55 years and older (%) | 27.6 | 30.6 | |
| Heaviness of Smoking Index | |||
| 0–1 (%) | 27.5 | 29.6 | χ2(2)=1.61 |
| 2–4 (%) | 65.8 | 63 | (P=0.448) |
| 5–6 (%) | 6.7 | 7.5 | |
| Income level | |||
| Low (%) | 28.5 | 22 | χ2(2)=144.40 |
| Moderate (%) | 31.7 | 20.1 | (P<0.001) |
| High (%) | 32 | 27.8 | |
| Not reported (%) | 7.7 | 30.1 | |
| Educational level | |||
| Low (%) | 17.4 | 29.2 | χ2(2)=146.59 |
| Moderate (%) | 30.1 | 45.4 | (P<0.001) |
| High (%) | 52.5 | 25.4 | |