Almost three quarters of children detained at Oberstown had substance misuse problems with drugs and or alcohol prior to their detention.
A report issued today by the detention centre also shows that over half were not in school while almost one in four had been diagnosed with a learning disability.
A third of the young people had lost one or both of their parents either through death, imprisonment or the absence of long term contact while four in ten had a mental health need and were in care or had an involvement with Tusla.
The report outlines the issues faced by young people in detention during the first quarter of this year because of conflict with the law.
Almost half of them had previously served detention orders.
The report also shows that in April of this year half of the children in detention were involved in incidents which required them to be separated from their group to manage their behaviour.
The Oberstown Detention Campus provides places for forty eight boys and six girls sent there by the Children's Court.
The Centre says each young person is assessed upon arrival and an individual care plan is developed by a multi-disciplinary team.
There were children detained during last August, all of whom were male.
Four of the children were 14 years old, 29 were on remand while 24 were serving committal orders.