Table 1. Summary of relevance and eligibility criteria of cohorts studied to assess the effect of the 2005 change in BCG policy, England, 2000–2010.
| Cohort | Vaccination programme | Eligible for the programmea | Birth status | Age in years at study entry | Year of study entry |
|---|---|---|---|---|---|
| Cohort 1 | Universal | Yes | UK born | 14 | 2000–2004 |
| Comparison cohort 1 | Universal | No | UK born | 14 | 2005–2010 |
| Cohort 1 | Universal | Yes | Non-UK born | 14 | 2000–2004 |
| Comparison cohort 1 | Universal | No | Non-UK born | 14 | 2005–2010 |
| Cohort 2 | Targeted | Yes | UK born | Birth | 2005–2010 |
| Comparison cohort 2 | Targeted | No | UK born | Birth | 2000–2004 |
| Cohort 2 | Targeted | Yes | Non-UK born | Birth | 2005–2010 |
| Comparison cohort 2 | Targeted | No | Non-UK born | Birth | 2000–2004 |
BCG: Bacillus Calmette–Guérin; UK: United Kingdom.
a Eligible signifies that the cohort fit the criteria for the vaccination programme and entered the study during the time period it was in operation not that the cohort was vaccinated by the vaccination programme.