These tables distinguish adult prisoners from young offenders and are broken down by gender.Information on previous convictions of prisoners in penal establishments is not held centrally.The available information on average sentence imposed on prisoners received into custody for selected crimes and offences is given in Tables 22 and 26 of the statistical bulletins "Prison Statistics Scotland, 1997", "Prison Statistics Scotland, 1998" and "Prison Statistics Scotland, 1999" published by the Scottish Executive, copies of which are available in the Parliament's Reference Centre (Bib numbers 11178, 11179 and 11180 respectively).