Young people report their own ethnicity. Staff working in secure training centres and young offender institutions then record this information on an administrative system.
Single separation incidents are measured as the number per 100 young people in custody. The numbers of young people in custody are counted at the beginning of each month, updated to include new admissions during the month, and then averaged across a 12-month period.
The data does not include young people in custody for whom ethnicity wasn’t known.
Rates per 100 young people have been rounded to 1 decimal place.
Youth justice statistics since 2008.
Further technical information
Data received from the establishments through monthly returns is validated through a reconciliation process on an annual basis. Figures published before the release of the 2016/17 Youth justice statistics may have been revised since their original publication.