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Selected external sources of evidence
Page contents: Systematic reviews | Economic evaluations | Other sources of evidence
Systematic reviews
A systematic review is a review of a clearly formulated question that uses systematic and explicit methods to identify, select and critically appraise relevant research, and to collect and analyse data from the studies that are included in the review. Statistical methods (meta-analysis) may be used to analyse and summarise the results of the included studies. Credible sources include:
- Centre for Reviews and Dissemination databases: particularly the Database of Abstracts of Reviews of Effectiveness (DARE) and the Health Technology Assessment (HTA) Database.
These databases confirm that the review is actually a systematic review, and give a summary and critical appraisal of the review. They will give you the reference for the review itself (and possibly a web link) but you will need to track down the actual review yourself. The DARE database also includes Cochrane Collaboration systematic reviews.
- The Cochrane Library
- The Cochrane Library is an online collection of evidence-based databases that contain different types of high-quality, independent evidence to inform healthcare decision-making. It includes the Cochrane Database of Systematic Reviews, which includes all Cochrane Collaboration systematic reviews and protocols. It also includes the Centre for Reviews and Dissemination databases and the Cochrane Central register of controlled trials.
- The Campbell Library
- The Campbell Collaboration (C2) helps people make well-informed decisions by preparing, maintaining and disseminating systematic reviews in education, crime and justice and social welfare. The Campbell Collaboration uses methods, processes and structures similar to the Cochrane Collaboration but also covers social interventions, while Cochrane focuses on healthcare interventions.
- Effective Public Health Practice Project
- EPHPP conducts systematic reviews on the effectiveness of public health interventions, and summarises recent, high quality reviews produced by others.
- Evidence for Policy and Practice Information and Coordinating Centre (EPPI-Centre)
This website enables you to search for systematic reviews across a wide range of topic areas using keywords and topic areas.
- Health-evidence Canada
This site aims to facilitate the adoption and implementation of effective policies/programs/interventions at the local and regional public health decision-making levels. It includes methodologically-sound reviews of health promotion and public health interventions published from 1985 to the present. Search fields include topic area, population characteristics, review type, intervention strategies and intervention location.
- National Institute for Health and Clinical Excellence
This link takes you directly to the published public health guidance. To find the reviews underpinning the guidance select the topic of interest and go down to the 'Background information' section. NICE guidance is based on the best evidence and is transparent in its development, consistent, reliable and based on a rigorous development process.
- Guide to Community Preventive Services, Centers for Disease Control and Prevention
The Guide to Community Preventive Services can help you choose programs and policies to improve health and prevent disease in your community. The systematic reviews conducted for the Guides can be found by selecting the topic and then following the links under ‘Community Guide Systematic Reviews’ for the intervention of interest.
Economic evaluations
Economic evaluation is the comparison of two or more alternative courses of action in terms of both their costs and consequences (Drummond et al.). Economists usually distinguish several types of economic evaluation, differing in how consequences (or benefits) are measured. These include: cost benefit analysis, cost-effectiveness analysis and cost-utility analysis. Credible sources include:
- Centre for Reviews and Dissemination database: The NHS Economic Evaluation Database - select the NHS EED tab.
- This database will confirm whether the study is actually an economic evaluation and not just a study of costs or valuation of outcomes. The site gives a summary and critical appraisal of the study, along with the reference for the study itself (and possibly a URL), but you will need to track down the actual review yourself.
- Paediatric Economic Database Evaluation (PEDE)
- This database only includes economic evaluations of paediatric populations. Cost analyses, cost descriptions or cost of illness studies are not included. A reference to the original study is included but you will need to track it down yourself.
Other sources of evidence
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