| Group code | Ethnicity |
| 1 | White British |
| 2 | Any other White (White Irish and any other White) |
| 3 | Asian (Indian, Pakistani, Bangladeshi, Chinese and any other Asian background) |
| 4 | Black (African, Caribbean and any other Black background) |
| 5 | Mixed White and Black (White and Black African and White and Black Caribbean) |
| 6 | Mixed White and Asian |
| 7 | Any other mixed (any other mixed background and any other ethnicity) |
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