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Derived variables: country of birth
| Applied to cases from: | |
| 1971, 1981, 1991, 2001 Census | Country of birth: grouped variables |
| 1971, 1981 1991 and 2001 Census (any or all) | Country of birth harmonised in 2001 categories |
| 1991 Census | Whether English is an official language in country of birth |
| 2001 Census | Whether English is an official language in country of birth |
| NBIR (births on LS birthdays) | Country of birth of mother recorded in NBIR: no grouping, adding value labels only |