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Assessing the quality of evidence
Having identified the studies to include in your review, you need to collate the data you have found in a meaningful way. This will require some knowledge of
statistical analysis techniques.
Cochrane Interactive Learning resources
Modules 6-7 of Cochrane Interactive Learning have information on performing a statistical analysis. The Library is subscribing to
Cochrane Interactive Learning.
How to analyse different types of data, effect measures, undertaking meta-analysis, recognising heterogeneity.
How to interpret results of systematic analysis, using GRADE method to report uncertainty of evidence.
A tool for grading quality of evidence in healthcare publications and guidelines. Developed by the Grading of Recommendations Assessment, Development and Evaluation Working Group.
Calculating effect size
Effect Size Calculator
Calculates effect sizes for meta-analysis (taking into account risk-ratios correlation coefficients and other factors). Provided by Campbell Collaboration.
Catalogue of bias
Advice on recognising and avoiding different types of bias that effect health evidence. Invites input from researchers. Provided by CEBM (University of Oxford).
Library resources on statistics
A database of e-books that you can search. For example, enter the term 'statistics' or 'Excel' or the name of a statistical package such as 'SPSS'.