Voices Impact Scale (VIS): A test of the psychometric properties of a new outcome measure of psychological interventions targeting voices.

Study ID: 32779
Short Title: Voices Impact Scale (VIS): Evaluation
Organisation: Solent NHS Trust
Location: Solent NHS Trust
Condition: Psychosis
Main Specialty: Mental Health
Expected End Date: 31/07/2018
Postcode: PO3 6AD
Contact Name: Solent Research
Contact Email: research@solent.nhs.uk
Active: Yes

Inclusion Criteria

Inclusion criteria (both stages): Participants will:

1) Be aged 18 years or over.

2) Have been hearing voices for at least a year.

3) Meet diagnostic criteria (DSM 5) for a psychosis spectrum condition (schizophrenia, schizoaffective disorder, delusional disorder or psychosis not otherwise specified) as verified by a mental health practitioner.

Exclusion Criteria

For part 2 – the participant must not have completed part one.

Study summary:

Despite the proliferation of psychological interventions for distressing voices there is a lack of consensus about primary outcome measurement. That is, different research trials use different ways of defining and measuring their primary outcome. Moreover, trials typically include measures of physical characteristics of voices (e.g. frequency, duration, loudness) which is in contrast to the primary aims of reducing distress and improving quality of life, the supposed aim of cognitive behaviour therapy for distressing voices (Birchwood & Trower, 2006). The lack of consensus about outcome measurement and the fact that we are potentially measuring inappropriate outcomes has hampered attempts to assess the effectiveness of psychological interventions for distressing voices. We have developed a new measure that aims to be used to evaluate the effectiveness of psychological intervention for voices. This measure has been developed using a Delphi process that involved consultation with researchers, clinicians and those with lived experience. The Delphi process determined which constructs this measure should try to quantify, as well as generating items and evaluating these. The measure we have now needs to be validated, to enable its use in evaluating therapies for voices. This study is in two stages. The first stage will involve participant completing a brief package of questionnaires, including our new measure. These will be completed anonymously. The second stage will involve different participants completing the same package of questionnaires, except some items from the new measure will likely have been eliminated following the first stage.

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