Self-inflicted deaths are any death of a person who has apparently taken his or her own life irrespective of intent. This not only includes suicides but also accidental deaths as a result of the person’s own actions. This classification is used because it is not always known whether a person intended to commit suicide.
To calculate the prison population, a 12-month average was used, based on prisoner counts done at the start of every month (where this data was available). Data on the prisoner population by age or by ethnicity was not available, so quarterly data was used to calculate these aspects of the prisoner population.
Ethnicity is based on self-reporting by prisoners and has not been independently validated. About 95% of prisoners reported their ethnicity for each year of the period studied.
Incidents are marked as ‘not recorded/unknown’ when prisoner details were either not available or not recorded in full at the time of the incident.
Information is provided by prisons and published by the Ministry of Justice after data checks are completed.
Rates per 1,000 are rounded to 2 decimal places.