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Reviews and pooled evidence

Evidence synthesis

Systematic reviews, meta-analyses and structured synthesis, from the question and protocol through screening, extraction, appraisal and reporting.

Services

ServiceWhat you get
Systematic reviewsA systematic review is not a long literature summary. It is a structured method that begins with a focused question and follows a transparent process for identifying, selecting, appraising and synthesising evidence.
Meta-analysisA meta-analysis is not producing a forest plot. The pooled estimate is only useful if the question, studies, outcomes, effect measures, assumptions and interpretation are appropriate.
Evidence synthesisFor questions that need more than a literature summary but may not need a full systematic review. We help choose the synthesis method before the project is locked into the wrong format.

Frequently asked questions

Is evidence synthesis the same as a systematic review?

No. A systematic review is one type of evidence synthesis. Some questions are better served by scoping, mapping or structured narrative approaches.

Can you help if screening has already started?

Yes. We can review the current stage, identify gaps in the method, and help organise the remaining work.

Related reading

  1. 01Reporting guidelines: which one applies, and how to use it properlyA checklist submitted with the manuscript is not the same as a study reported completely. Used at the end, guidelines catch omissions; used at the start, they prevent them.
  2. 02Publication bias: funnel plots, Egger's test and what they can and cannot showFunnel plot asymmetry has several explanations and publication bias is only one of them. Reading it as proof of missing studies is a common and consequential error.
  3. 03How to build a systematic review search strategyA search is reproducible or it is not a systematic search. Here is how to build one that another researcher could run and get the same results.

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