Demographic characteristics of 22 974 participants aged 4–23.9 years from seven national health and social surveys
| Survey | Year | England | Scotland | Wales | Age range (years) | Sample size |
|---|---|---|---|---|---|---|
| Health Survey for England | 1995 | √ | 5–23 | 3485 | ||
| Health Survey for England | 1996 | √ | 5–23 | 4198 | ||
| Health Survey for England | 1997 | √ | 5–23 | 5520 | ||
| Health Survey for England | 1998 | √ | 4–23 | 3756 | ||
| Scottish Health Survey | 1995 | √ | 16–23 | 707 | ||
| Scottish Health Survey | 1998 | √ | 5–23 | 3043 | ||
| National Diet & Nutrition Survey | 1997 | √ | √ | √ | 4–19 | 1905 |
| Overall | 22 974 |