title: Using meta-analysis to summarise evidence within systematic reviews.
abstract: Systematic review and meta-analysis are two methods, used to summarise scientific evidence in order to inform further research and policy, that are being used with increasing frequency. It is important, therefore, that nurses and other health professionals understand how a systematic review and meta-analysis are carried out, and something of the relationship between the two methods. Systematic review, also known as overview, and meta-analysis can provide concise information for providers, purchasers and patients. However, it is helpful to appreciate when it may, or may not, be appropriate to perform them, as they are often a justification for wide ranging claims made about effectiveness of healthcare interventions.
authors.forename: Jenny
authors.initials: J
authors.lastname: Greener
authors.affiliation: Health Services Research Unit, University of Aberdeen, Aberdeen.
authors.forename: Jeremy
authors.initials: J
authors.lastname: Grimshaw