Age data in this collection is generally calculated from the recorded date of birth until the date of interest. Where this calculation has resulted in anomalous results, such as negative numbers, less than fifteen years old, then the offender is grouped with those of an "Unknown" age.
Corrections Department NZ > Research > Offender Volumes Report > Offender Volumes Report 2007 > 10 Data definitions and groupings > 10.3 Age
