Broadmoor in numbers: What you didn't know about the Berkshire hospital

As Broadmoor Hospital opens its doors for first time in 150 years to be filmed in a new ITV documentary, interesting facts and statistics about the institution are revealed.

Broadmoor is a hospital, not a prison. It is one of three high-security psychiatric hospitals in England.

Boradmoor Hospital is located in Berkshire and was founded in 1863.

Staff at Broadmoor Hospital:

• 420 nurses

• 12 consultants

• Range of professional staff include psychologists, occupational therapists, social workers, teachers and specialists in physical and vocational activities.

Number of wards and patients:

• There are 15 wards in total.

• Each ward has between eight and 20 patients

• Broadmoor holds 210 patients, with a turnover of around 50 a year.

The average age of patients at admission is 29.

Read: Cameras allowed inside Broadmoor for first time in 150 years

Where do patients come from?Patients come from London and the south.

• A third from the courts for assessment before trial or sentencing.

• A third from prison.

• A third may have committed no offence but require treatment in more secure conditions.

Illnesses treated:

• Severe mental illness, such as schizophrenia.

• Personality disorders, mostly ‘anti-social’ type.

Length of stay at Broadmoor Hospital:

On average the length of stay is just under five years, although many stay for a much shorter time.

Fewer than 5% have been at the hospital for over 20 years.

Once patients are assessed as ready to leave Broadmoor, where do they move on to?

• 35% NHS medium-security unit.

• 30% independent medium-security unit.

• 15% prison.

The documentary team were given unprecedented access to the wards for filming the programme which will be broadcast tonight at 9pm.