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Data for time out of cell on weekdays are collated by overall prison establishment and are not disaggregated for different prisoner age groups in individual establishments. Data are no longer collated for time out of cell on weekends but are available for the period April 2005 to March 2008.
Figures for time out of cell for each young offender institute (aged 18 to 20) and each young offender institute holding young persons (aged under 18) for each month since April 2005 are set out in a table for weekdays and weekends where available. The table has been deposited in the Library.
The figures used in the answer have been drawn from administrative IT systems, which, as with any large-scale recording system, are subject to possible errors with data entry and processing.