![]() A blinded RCT means that any information that can bias the outcome, reduce detection or effect performance is withheld until after the experiment is complete.Ĭohort studies are longitudal studies that samples a group of people that share defining characteristics, such as have given birth, have graduated university or have undergone a treatment programme. The difference between the groups is the outcome variable being studied. A RCT randomly assigns participants into an experimental group or a control group. Randomised controlled trials (RCT) is the investigation into the effect of a treatment or intervention. Systematic reviews use clearly formulated research questions and systematic and reproducible methods to identify, select and critically appraise all relevant research and collect and analyse data from the studies included in the review. Various guidelines and tools are available to ensure that the variables and data underlying the estimates of effects are comparable. The highest grade of evidence is produced by meta-analyses that summarize the evidence from systematic reviews of RCTs. ![]() ![]() Meta-analyses use statistical methods to summarize the results found in a systematic review.
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