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Writing a Systematic Review Singapore Med J 2010; 51(5) : 362 CME Article Effective Medical Writing Pointers to getting your article published Ng K H, Peh W C G Writing a systematic review ABSTRACT regarded as popular evidence-based tools for analysis of Evidence-based medicine (EBM) aims to combine clinical studies, and they are frequently used to answer the best available scientific evidence with clinical complex research questions across many different clinical experience and individual judgment of patient elds.(3) Meta-analysis is for the specic statistical technique needs. In the hierarchy of scientific evidence, of combining the data from individual studies. systematic reviews (along with meta-analyses) A systematic review is a rigorous way of summarising occupy the highest levels in terms of the quality the available scientic evidence that is derived from several of evidence. A systematic review is the process clinical trials on a particular treatment or method. It uses a of searching, selecting, appraising, synthesising methodology of clearly-designed questions and methods to and reporting clinical evidence on a particular identify and critically evaluate relevant research, followed question or topic. It is currently considered by the collection and analysis of data from the studies that the best, least biased and most rational way to are included in the review. Since the results of a single organise, gather, evaluate and integrate scientific study apply only to a certain type of patient or a particular evidence from the rapidly-changing medical and clinical setting, a systematic review of many studies on the healthcare literature. Systematic reviews could same subject can provide information that is relevant to a be used to present current concepts or serve broad range of patients across different clinical settings. as review articles and replace the traditional Moreover, individual studies consist of different sample expert opinion or narrative review. This article sizes, thus biased opinion is inevitably introduced into the explains the structure and content of a systematic studies. A systematic review limits bias while improving review. the reliability and accuracy of recommendations because it combines information from individual studies and has an Keywords: evidence-based medicine, medical overall sample size that is greater than that of any one study. writing, systematic review This leads to an increase in the quality of the review. In Biomedical Imaging Singapore Med J 2010; 51(5): 362-366 short, a systematic review is currently considered to be the and Interventional best, least biased and most rational way to organise, gather, Journal, c/o Department of INTRODUCTION evaluate and integrate scientic evidence from the rapidly- Biomedical Imaging, University of Malaya, Evidence-based medicine (EBM) integrates the best changing medical and healthcare literature. Kuala Lumpur 50603, scientic evidence with clinical expertise and individual Malaysia judgment of patient needs. While the evidence from one STRUCTURE AND CONTENT OF A Ng KH, PhD, MIPEM, DABMP, scientic trial may refer to a particular method or practice SYSTEMATIC REVIEW Editor as the best in current clinical practice, the evidence may A systematic review follows the same structure as an Singapore Medical change over time as new treatments or methods are original research article. Journal, 2 College Road, developed. EBM is based on clinical evidence derived Singapore 169850 from randomised controlled trials, systematic reviews, Title: The title of the systematic review should accurately Peh WCG, meta-analyses and clinical guidelines. The hierarchy of the MD, FRCP, FRCR, reect the topic under review. Some examples of titles are: Advisor strength of evidence for decision-making and treatment • Is there a role for endorectal balloons in prostate Correspondence to: options ows from the top ranking of randomised controlled radiotherapy? A systematic review Prof Ng Kwan Hoong Tel: (60) 3 7949 2069 trials, to systematic reviews of these randomised trials, all • Diagnostic value of non-invasive imaging techniques Fax: (60) 3 7949 4603 the way down to unsystematic clinical observations.(1,2) in the detection of carotid artery stenosis: A systematic Email: [email protected]. my Therefore, systematic reviews and meta-analyses are review Singapore Med J 2010; 51(5) : 363 • A systematic review of pharmacological this issue should be addressed. interventions for acute ischaemic stroke • Study selection: Describe the selection method and screening for eligibility for all the studies that were Abstract: A structured abstract that summarises the identified, removing duplicates and screening for background, methods, results and conclusion should relevance of the title, followed by abstract and full follow. text article; and then screening of the full papers that passed all of these eligibility checks. A flow Introduction: The introduction should summarise the chart is recommended to demonstrate the search topic and explain the necessity for conducting such a strategy utilised (Fig. 1). systematic review. For example, were there gaps in the knowledge of the topic, or was there disagreement in the Medical database literature? The introduction should be brief and the last sentence should clearly state the aims of the review. 121 Articles 51 Excluded (Citations retrieved from the database) (Reading of abstract) Box 1. Structure of a systematic review: 42 Excluded 70 Articles • Title (Do not meet the criteria) • Structured abstract • Introduction • Methods 28 Used in the study • Results Fig. 1 Flow chart for identifying eligible articles. • Discussion • References (extensive number) • Data extraction: Describe what data were extracted from the studies, such as the description of patients/ Methods: Explain the review methodology clearly and subjects/animals included, how many had what logically. outcome, what the summary statistics were as given in the paper, and whether the data was read • Inclusion and exclusion criteria: Describe the off graphs if these were not provided numerically. studies to be included, e.g. a prospective study Data should be independently extracted from the in a particular population testing a particular studies by at least two researchers to avoid biased treatment. In this section, use subheadings, e.g. opinions. who the patients/subjects/animals were; what the • Quality assessment: Quality assessment criteria interventions/characteristics sought were; and what have been described for most literature types and the outcome measures and study characteristics many of these are available on the EQUATOR were. Mention certain key features of the study such Network (www.equator-network.org). as the sample size, the main results, whether there • Data analysis: Describe briefly the statistical was any language restriction or years within which methods of handling the data. In a review on the studies had to be done. What were the studies treatment, it is typical to calculate the odds ratios excluded from the review? for each outcome with 95% confidence intervals and • Identication of studies: Provide details of the p-value for the magnitude of effect, and to perform electronic database search carried out, including the tests of heterogeneity to ascertain if the studies were databases used (e.g. MEDLINE, Scopus, ISI Web all coming broadly to the same conclusion or if there of Knowledge, Google Scholar), and the period were significant variations between the studies. The of search. Provide a list of the search terms in an analysis may also be influenced by the amount of appendix. Keywords used in the searching of studies data available. Heterogeneity needs to be assessed should be listed in this section. State whether any for each outcome. The studies or outcomes can be of the journals were identied using hand-searching sorted into different subtypes to determine whether (e.g. reference list of articles obtained) and whether this reduces any heterogeneity, for example, in a review articles and other bibliographies were systematic review of a treatment, the studies may referenced. In most reviews, only studies published be sorted by dose, by time of administration after in the English language are included; however, some the onset of disease or by time of assessment of researchers may include non-English studies and outcome. Singapore Med J 2010; 51(5) : 364 Results: As with the methods section, the results suggest that some particular feature is associated with section needs to be described logically. future risk of a disease? Is one diagnostic test better than another? Can a less invasive interventional procedure be • Search results: Mention the number of studies the reliably used as an alternative to the conventional invasive literature search had identified from each database procedure? If there is not enough evidence to arrive at a as well as by other searching methods, how many denite conclusion, then the statement should clarify were duplicates, how many were excluded on the that. basis of screening of an abstract, how many full The subsequent paragraphs should describe the text articles were assessed and of these, how many limitations of the studies included and the reliability of the were excluded until the final number of papers results. How robust are the results? Were there any biases? to be included was determined. Also mention the Next, describe the strengths and weaknesses of the review number of papers not included in the review due to methods. For example, were non-English publications
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