Condition category
Mental and Behavioural Disorders
Date applied
Date assigned
Last edited
Prospectively registered
Overall trial status
Recruitment status
No longer recruiting
Publication status

Plain English Summary

Background and study aims
Depression is the most common of all mental health problems. Around 1 in 7 older people (aged over 75) suffer from depression. Depression in older people is associated with poor quality of life and increased health and social care use. As the ageing population grows, solutions are needed to meet the specific needs of older people. CASPER PLUS is a study of a primary care-based psychological treatment, called ‘collaborative care’, for older people with depression. The aim of the study is to establish the clinical effectiveness and cost effectiveness of collaborative care for older people with depression.

Who can participate?
All patients aged 65 and over in participating GP practices will be invited to take part in the study.

What does the study involve?
Eligible participants who consent to take part are allocated into one of two groups: the Collaborative Care group or Usual GP Care. This is done through a computerised process called ‘randomisation’, which means participants are allocated to groups purely by chance, in a similar way to using the toss of a coin.
Collaborative Care participants are assigned to a specialist health worker, called a Case Manager. They work closely with the participant for a period of 8 to 10 weeks, providing support and information to help them recover from depression, to improve their mental wellbeing and to keep well in future.
Collaborative care may also involve medication management, in cases where the participant has been prescribed medication. The case manager liaises with the participant’s GP regarding their care.
Collaborative Care has shown promising trial results in the United States of America (USA). However the transferability of this model of service to the UK NHS cannot be assumed. The National Institute for Health and Clinical Excellence (NICE) has identified this as an important intervention that should be subject to further studies.

What are the possible benefits and risks of participating?
The possible benefits are that participants may be offered collaborative care, which may not be currently available in their GP practice. A large study in the USA using collaborative care has shown positive results in improving levels of depression among older adults. The CASPER Plus trial is conducted through the National Health Service (NHS). All NHS research is approved by of an independent Research Ethics Committee, to protect the safety, rights, wellbeing and dignity of participants. There are no expected risks in participating in the study.

Where is the study run from?
The main centre of the trial is York. A number of GP practices in and around the area will invite patients over 65 to take part in the study. We also expect to recruit participants from GP practices in and around Leeds, Durham and Newcastle.

When is the study starting and how long is it expected to run for?
August 2012 to June 2015

Who is funding the study?
National Institute for Health Research (UK)

Who is the main contact?
Prof. Simon Goodbody
(updated 17/11/2020, previously: Dr Helen Lewis

Trial website

Contact information



Primary contact

Prof Simon Gilbody


Contact details

Department of Health Sciences
University of York
YO10 5DD
United Kingdom
+44 (0)1904 430 000

Additional identifiers

EudraCT number number

Protocol/serial number

HTA 10/57/43, Protocol number: R12237

Study information

Scientific title

The CASPER-PLUS trial: CollAborative care in Screen Positive EldeRs with major depressive disorder - a pragmatic randomised controlled trial



Study hypothesis

CASPER-PLUS is a sub study of the wider CASPER study (ISRCTN02202951), a cohort study and randomised controlled trial (RCT) looking at the effectiveness of collaborative care in older patients with sub-threshold depression, using a database screening approach in rectuiting patients.

CASPER-PLUS aims to establish the clinical and cost effectiveness of a collaborative care intervention for older people with screen-positive above-threshold depression ('major depressive episode') within a definitive RCT.

Ethics approval

NRES Committee Yorkshire & Humber - Leeds East, 20/04/2012, ref: 10/H1306/61

Study design

Pragmatic multi-centre randomised controlled trial

Primary study design


Secondary study design

Randomised controlled trial

Trial setting

GP practices

Trial type


Patient information sheet


Depression / mental well-being


Eligible participants who have consented to be in the trial will be randomised into one of two intervention groups: 1. Collaborative Care (including Behavioural Activation) intervention with medication monitoring and management
2. Usual care

This psychological intervention is a bespoke collaborative care designed and delivered specifically for those aged 65 or over with above threshold, case-level depression over 8-10 weekly sessions. Collaborative care will be delivered by a case manager (a primary care mental health worker) within a 'stepped care framework', such that those whose depression deteriorates are 'stepped up' from low intensity care to a more intensive form of management including medication monitoring.

The five core components of the intervention are described below:
1. Patient-centred assessment and engagement: Patients are first assessed in their own residential setting. The severity of depression and associated behavioural and social deficits are assessed and patient information materials are given.
2. Symptom measurement and monitoring: A standardised assessment of symptom severity is made. Symptom tracking (to judge response, failure to respond or deterioration) is then made at all subsequent patient contacts.
3. Medication management: The prescription of anti-depressant medication is entirely at the discretion of the General Practitioner. We will encourage GPs to consider NICE guidance in their prescribing decisions. The concordant use of medication by patients will be encouraged by the case manager if a prescription has been initiated by the GP. Patient concerns (such as addiction) and non-compliance will be addressed during sessions. There will be active liaison with GPs to encourage follow up patient appointments with the GP if poor concordance is noted.
4. Active follow-up: All patients are followed up by the CM for eight weeks using face to face meetings or telephone contacts.
5. Delivery of behavioural activation (BA): Patients are offered the option of behavioural activation delivered over eight sessions by their case manager. BA consists of a structured programme of reducing the frequency of negatively reinforced avoidant behaviours in parallel with increasing the frequency of positively reinforcing behaviours to improve functioning and raise mood. During this time patients will remain under the medical care of their GP.

The additional elements of collaborative care include: telephone support; symptom monitoring and active surveillance (facilitated by computerised case management systems – PC-MIS); medication monitoring; low intensity psychosocial intervention (behavioural activation). The work of case managers is supervised by an older persons’ mental health specialist (old age psychiatrist or psychologist).

Control intervention
Participants allocated to the control condition will receive usual primary care management of case level depression offered by their GP, in line with NICE depression guidance and local service provision.

Intervention type



Not Applicable

Drug names

Primary outcome measure

Current primary outcome measure as of 17/11/2020:

Primary outcome measure is depression severity measured by the PHQ9. The primary time point for the primary outcome measure is 4 months. PHQ9 also measured at 12 and 18 months to examine any sustained impact of the intervention


Previous primary outcome measure:

Depression severity measured by the PHQ9 at 4,12 and 18 months

Secondary outcome measures

Current secondary outcome measures as of 17/11/2020:

1. Quality of Life measured by SF-12 at 4, 12 and 18 months
2. Anxiety measured by GAD-7 at 4, 12 and 18 months
3. Somatic symptoms measured using PHQ-15 at 4, 12 and 18 months
4. Resilience using the CD-RISC2 at 4, 12 and 18 months
5. Cost-effectiveness including the EQ-5D, prescribed medication and health and social care use


Previous secondary outcome measures:

Presence/absence of depression diagnosis as ascertained by interview

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

1. CASPER participants will be identified by comprehensive screening strategies in primary care (replicating that which is incentivised in QOF-compliant case finding for those with CHD and diabetes).
2. Older people (aged 65 and above)
3. Who screen-positive for depression on the recommended QOF 2 question brief depression screen (sometimes referred to as the "Whooley" questions after their initial validation study ), but who on further assessment have Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) Major Depressive Disorder (MDD)

Participant type


Age group




Target number of participants


Participant exclusion criteria

1. Known alcohol dependency (as recorded on GP records)
2. Any known co-morbidity that would in the GP’s opinion make entry to the trial inadvisable (e.g. recent evidence of self harm, known current thoughts of self harm, significant cognitive impairment)
3. Other factors that would make an invitation to participate in the trial inappropriate (e.g. recent bereavement; terminal malignancy)
4. Known to be experiencing psychotic symptoms (as recorded on GP records)

Recruitment start date


Recruitment end date



Countries of recruitment

United Kingdom

Trial participating centre

University of York
YO10 5DD
United Kingdom

Sponsor information


University of York (UK)

Sponsor details

c/o Sue Final
YO10 5DD
United Kingdom

Sponsor type




Funder type


Funder name

Health Technology Assessment Programme

Alternative name(s)

NIHR Health Technology Assessment Programme, HTA

Funding Body Type

government organisation

Funding Body Subtype

National government


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

Basic results (scientific)

Publication list

2014 protocol in:
2015 qualitative study results in:
2016 erratum in:
2017 report to funder

Publication citations

Additional files

Editorial Notes

17/11/2020: The following changes were made to the trial record: 1. The primary outcome measure was changed. 2. The secondary outcome measures were changed. 3. The trial website was changed from to 4. Publication reference added. 5. The plain English summary was updated. 22/06/2016: Publication reference added. 05/05/2016: Publication reference added.