Systematic reviews and meta analysis: introduction

8 important questions on Systematic reviews and meta analysis: introduction

Why are literature reviews helpful/ informative?

  • They can provide you w/ up to date information
  • Identifying significant issues/ themes for further research (research gaps)
  • Guiding development of research topics / questions
  • Presenting the used methodologies and research tools

What are some types of literature reviews

  • Narrative or traditional reviews
  • Critical reviews
  • Scoping reviews
  • Systematic reviews

Aren't as black and white as presented here in the slides
Goes from less to best

What is this types of literature review: narrative / traditional reviews?

  • General overview of the literature
  • Usually no specific research question as point of departure
  • Often has diverse/ multiple aims and purposes
  • Different types of studies/ literature are taken into account but often no aim to be comprehensive in selection of included studies
  • Expert based
    • Selection of studies potentially biased
    • Weighting of studies not transparent
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The fourth type of literature review: systematic review

  • Is very transparent
  • Departs from a specific research question
  • Follows the real methodology
  • Quality assessment which may determine inclusion/ exclusion (very specific criteria)
  • Gives recommendations for clinical practice and future research

Why is it important to summarise studies

  • There is an overload of information/ evidence, hard to keep up with
  • Therefore systematic overviews are created, and they also need to be updated when new evidence is found --> Cochrane quote

What does the Cochrane collaboration do?

Exists so that healthcare decisions get better; and our strategy to 2020 aims to put Cochrane evidence at the heart of health decision making all over the world. Ir organises our work around four goals:
  1. Producing evidence
  2. Making our evidence accessible
  3. Advocating for evidence
  4. Building an effective and sustainable organisation

A small summary of two methods of reviews

See the image

What is this type of literature review: critical reviews

  • This is one step up to the other method
  • Aims to demonstrate writer has extensively researched literature & crucially evaluated its quality
  • Goes beyond mere description and includes some degree of analysis and conceptual innovation
  • Typically results in hypothesis or model
  • Seeks to identify most significant items in the field
  • No formal quality assessment of included studies
  • Analysis are typically narrative, perhaps conceptual or chronological
  • Seeks to identify conceptual contribution to embody existing or derive new theory
  • Not very transparant

The question on the page originate from the summary of the following study material:

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