Lake Alice Hospital
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Patients were subjected to massive doses of medication and the use of electroconvulsive therapy as a punishment.
Former patients have been in contact with the Abuse in Care Royal Commission, prompting it to revise the number who had been in the unit between 1972 and when it closed in 1978.
Although no official records were kept it was thought the number was around 200 young people, but now the number is believed closer to 300.
Lead Investigation counsel Andrew Molloy said the new figure has come from a raft of new and valuable information his team has obtained through interviews with former patients, psychiatrists, psychologists, teachers and social workers - many of whom have never been interviewed before.