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Developing and Evaluating Complex Interventions: New - IReSP

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MRC/CSO Social and Public Health Sciences Unit, University of Glasgow.

Developing and Evaluating Complex Interventions: New GuidancePeter CraigInstitut de Recherche en Santé Publique, Paris, 29 January2015

MRC/CSO Social and Public Health Sciences Unit, University of Glasgow.Outline

What is a complex intervention?

A phased approach•

Development

Feasibility and piloting

Evaluation

Implementation

Recent developments

Forthcoming events

MRC/CSO Social and Public Health Sciences Unit, University of Glasgow.The UK Medical Research Council guidance

MRC/CSO Social and Public Health Sciences Unit, University of Glasgow.What is a complex intervention?

Number of interacting

components

Number and difficulty of

behaviours involved

Number of groups or

organisational levels targeted

Number and variability of

outcomes

Degree of flexibility or

tailoring permitted

Good theoretical grasp of

the change process

Implementation vs.

intervention failure

Individual variation may

reflect higher level processes

A range of outcome

measures

Interventions may work

better if adaptation to local context is permitted

MRC/CSO Social and Public Health Sciences Unit, University of Glasgow.Evaluating complex interventions

MRC/CSO Social and Public Health Sciences Unit, University of Glasgow.Developing an intervention

Develop interventions systematically•

Use best available evidence, ideally from systematic review(s)

Develop theoretical understanding of process of

change

Model process and outcomes

An iterative, not necessarily linear process•

May go "back" to an earlier phase at any point

Implementation considerations should guide all phases• "Would it be possible to use this?" MRC/CSO Social and Public Health Sciences Unit, University of Glasgow.Feasibility and piloting MRC/CSO Social and Public Health Sciences Unit, University of Glasgow.Feasibility studies Research done before a main study to answer the question "Can this study be done?". They are used to estimate important parameters that are needed to design the main study, e.g.• standard deviation of the outcome measure, which may be needed to estimate sample size; willingness of participants to be randomised/willingness of clinicians to recruit participants; number of eligible patients, carers or other appropriate participants; characteristics of the proposed outcome measure follow-up rates, response rates to questionnaires, adherence/compliance rates, ICCs for cluster trials, etc. MRC/CSO Social and Public Health Sciences Unit, University of Glasgow.Pilot studies A version of the main study that is run in miniature to test whether the components of the main study can all work together Focused on the processes of the main study, for example to ensure recruitment, randomisation, treatment, and follow-up assessments all run smoothly A pilot will resemble the main study in many respects, including an assessment of the primary outcome. MRC/CSO Social and Public Health Sciences Unit, University of Glasgow.Evaluation MRC/CSO Social and Public Health Sciences Unit, University of Glasgow.Assessing effectiveness

Choosing an appropriate evaluation design•

Trials are the gold standard, but there ARE alternatives to the classical RCT, e.g:•

Cluster randomisation

Stepped wedge designs

Preference designs

Randomised consent

Non-randomised designs

With the exception of cluster RCTs these are rare, but stepped wedge designs allow randomisation to be built into large scale implementation and deserve to be more widely used.

MRC/CSO Social and Public Health Sciences Unit, University of Glasgow.Understanding the change process

Failure or unanticipated outcomes are common with

complex interventions

Intervention failure or implementation failure?

Process evaluation can help to distinguish such

outcomes, and to understand how interventions achieve their effects MRC/CSO Social and Public Health Sciences Unit, University of Glasgow.Implementation MRC/CSO Social and Public Health Sciences Unit, University of Glasgow.Reporting

Full reporting is

essential

Important to include a

detailed description of the intervention and the context

Wide-ranging set of

guidelines now available'Much healthcare research is wasted because its findings are unusable.' www.equator-network.org MRC/CSO Social and Public Health Sciences Unit, University of Glasgow.Influencing decision-makers

Implementation is a behaviour change problem!

Ask research questions that matter to patients,

practitioners and policy-makers Involve stakeholders in planning and conducting the research

Provide evidence in an integrated and graded way

Identify the elements relevant to decision-making

Make recommendations as specific as possible

Take a multifaceted approach

Exploit opportunities for long-term follow-up

MRC/CSO Social and Public Health Sciences Unit, University of Glasgow.Summary Adequate, rigorous assessment of complex interventions requires careful development work, appropriate choice of evaluation design, incorporation of process measures, and a concern for implementation throughout the whole process. There arealternatives to the classical RCT - but all methods have drawbacks, and the choice should made after a careful consideration of the whole range of options. MRC/CSO Social and Public Health Sciences Unit, University of Glasgow.Recent developments • MRC guidance on • Process evaluation evaluation-guidance.pdf•Natural experiments www.mrc.ac.uk/naturalexperimentsguidance Craig P et al., Using natural experiments to evaluate population health interventions: new Medical Research Council Guidance. Journal of Epidemiology and Community Health. 2012;66:1182-1186. • Reporting guidelines for • Pilot and feasibility studies • Social and psychological interventions • Implementation studies MRC/CSO Social and Public Health Sciences Unit, University of Glasgow.

Forthcoming ...

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