Condition category
Musculoskeletal Diseases
Date applied
Date assigned
Last edited
Retrospectively registered
Overall trial status
Recruitment status
No longer recruiting

Plain English Summary

Background and study aims:
Delusions are a key symptom of severe mental illnesses, particularly schizophrenia. Persecutory delusions are one of the most common psychotic symptoms and are frequently associated with distress, suicide and admission to psychiatric hospital. Existing treatments, pharmacological and psychological are only partially effective. A way to improve treatment is to target the mechanisms causing delusions to persist. A cognitive model of persecutory delusions indicates that negative beliefs about the self are important in the development and maintenance of persecutory delusions and this is supported by recent research. Psychological interventions based on cognitive behavioural theory and techniques have been shown to change people's negative beliefs about themselves in patients with affective disorders. Recent research also suggests that CBT interventions targeted at underlying mechanisms of delusions are effective and popular with psychosis. The evidence suggests that a cognitive behavioural intervention designed to target negative beliefs about the self in people with persecutory delusions may be effective at changing people's negative beliefs and hence their persecutory delusion. The current research will conduct a study to test this prediction.

Who can participate?
Males and females, aged 18-70. Participants will be recruited from inpatient and outpatient mental health services. They will be currently experiencing a persecutory delusion and have negative beliefs about themselves.

What does the study involve?
Participants will complete three assessments at three different time points- at 0 weeks (the beginning of their involvement in the study), at 8 weeks and at 12 weeks. These assessments will measure how participants are feeling about themselves and other people. Between the 0 week and 8 week assessments half of the participants will receive 6 sessions of cognitive behaviour therapy (CBT) designed to target the negative beliefs they have about themselves. This will be in addition to their usual treatment. The other half of the participants will continue to receive their usual treatment but with no extra therapy sessions. Who receives the therapy straight away is decided by a process called randomisation, which is like a coin toss. At the end of the study we will compare the two groups on their assessment scores to see if there is any benefit of receiving the additional therapy sessions.

What are the possible benefits and risks of participating?
The talking therapy has been designed to help with improving self-confidence. This may help to reduce anxiety and worries about others. There are not any risks in taking part. Evidence suggests that cognitive-behavioural therapy can be helpful for people who are experiencing worries about others and the therapists have previous experience of delivering cognitive-behavioural therapy to patients.

Where is the study run from?
University of Oxford in collaboration with Oxford Health NHS Foundation Trust

When is the study starting and how long is it expected to run for?
The study started in July 2012 and will be recruiting for 1 year. Participants will be involved in the study for 12 weeks.

Who is funding the study?
Medical Research Council, UK

Who is the main contact?
Dr Katherine Pugh

Trial website

Contact information



Primary contact

Dr Katherine Pugh


Contact details

University of Oxford
Department of Psychiatry
Warneford Lane
United Kingdom
+44 (0)1865 226468

Additional identifiers

EudraCT number number

Protocol/serial number


Study information

Scientific title

A randomised controlled test of reducing negative beliefs about the self in people with persecutory delusions: improving self-confidence


Study hypothesis

It is hypothesised that a brief cognitive behavioural intervention designed to target negative beliefs about the self will reduce negative beliefs about the self and persecutory delusions in patients currently experiencing a persecutory delusion.

Ethics approval

NRES Committee South Central - Oxford B, 25/07/2012 ref: 12/SC/0369

Study design

Randomised interventional trial

Primary study design


Secondary study design

Randomised controlled trial

Trial setting


Trial type


Patient information sheet

Not available in web format, please use the contact details below to request a patient information sheet


Schizophrenia, Psychosis


The study will recruit 30 patients to be randomised to either 6 weeks treatment or a control condition and it is the additional receipt of the intervention to standard psychiatric treatment that will be evaluated. Measurements will be taken at three time points: pre-treatment, post-treatment and one month follow-up. Participants will be recruited from inpatient and outpatient services in Oxford Health NHS Foundation Trust.

Improving self-confidence, 6 session intervention using CBT techniques to reduce negative beliefs about the self and boost positive beliefs.

Intervention type



Not Applicable

Drug names

Primary outcome measures

Brief Core Schema Scale measured at 0 weeks, 8 weeks and 12 weeks

Secondary outcome measures

1. Beck Anxiety Inventory measured at 0 weeks, 8 weeks, 12 weeks
2. Beck Depression Inventory measured at 0 weeks, 8 weeks, 12 weeks
3. Paranoid Thoughts Scale measured at 0 weeks, 8 weeks and 12 weeks
4. Psychotic Symptom Rating Scale - Delusions subscale measured at 0 weeks, 8 weeks and 12 weeks
5. The Robson Self-Concept Questionnaire measured at 0 weeks, 8 weeks, 12 weeks
6. Warwick-Edinburgh Mental Well-being scale measured at 0 weeks, 8 weeks, 12 weeks

Overall trial start date


Overall trial end date


Reason abandoned


Participant inclusion criteria

1. A current persecutory delusion as defined by Freeman and Garety (2000)
2. Scoring at least 3 on the conviction scale of the PSYRATS (Haddock et al., 1999)
3. That the delusion has persisted for at least three months; a clinical diagnosis of schizophrenia, schizoaffective disorder or delusional disorder (i.e. a diagnosis of non-affective psychosis (F2) in the International Classification of Diseases and Diagnostic and Statistical Manual IV)
4. Negative beliefs about the self (as indicated by endorsing at least one negative schematic belief on the Brief Core Schema Scale (Fowler et al., 2006))
5. Aged between 18 and 70
6. Where major changes in medication are being made, entry to the study would not occur until at least a month after stabilisation of dosage
7. Male & female participants

Participant type


Age group




Target number of participants

UK Sample Size: 30

Participant exclusion criteria

1. A primary diagnosis of alcohol or substance dependency
2. Organic syndrome or learning disability
3. A command of spoken English inadequate for engaging in therapy or the assessments
4. Currently having individual CBT (though previous experience of CBT is not an exclusion)

Recruitment start date


Recruitment end date



Countries of recruitment

United Kingdom

Trial participating centre

University of Oxford
United Kingdom

Sponsor information


Oxford University (UK)

Sponsor details

Department of Psychology
United Kingdom

Sponsor type




Funder type

Research council

Funder name

Medical Research Council

Alternative name(s)


Funding Body Type

private sector organisation

Funding Body Subtype

other non-profit


United Kingdom

Results and Publications

Publication and dissemination plan

Not provided at time of registration

Intention to publish date

Participant level data

Not provided at time of registration

Results - basic reporting

Publication summary

2014 results in:

Publication citations

Additional files

Editorial Notes