Sample size calculation for stepped wedge and other longitudinal cluster randomised trials
نویسندگان
چکیده
منابع مشابه
Sample size calculation for a stepped wedge trial
BACKGROUND Stepped wedge trials (SWTs) can be considered as a variant of a clustered randomised trial, although in many ways they embed additional complications from the point of view of statistical design and analysis. While the literature is rich for standard parallel or clustered randomised clinical trials (CRTs), it is much less so for SWTs. The specific features of SWTs need to be addresse...
متن کاملGroup sequential designs for stepped-wedge cluster randomised trials
BACKGROUND/AIMS The stepped-wedge cluster randomised trial design has received substantial attention in recent years. Although various extensions to the original design have been proposed, no guidance is available on the design of stepped-wedge cluster randomised trials with interim analyses. In an individually randomised trial setting, group sequential methods can provide notable efficiency ga...
متن کاملStepped-wedge cluster randomised trials: where, when and why?
The stepped wedge (SW) cluster randomised trial (CRT) design is being utilised at increasing pace. However, little is known about the standard of reporting of such trials, or how useful the design has proven to be in hindsight. Moreover, much debate exists around when the design should be preferred to the more classical parallel group (PG) CRT. Here, we address these issues by first conducting ...
متن کاملSystematic review finds major deficiencies in sample size methodology and reporting for stepped-wedge cluster randomised trials.
BACKGROUND Stepped-wedge cluster randomised trials (SW-CRT) are increasingly being used in health policy and services research, but unless they are conducted and reported to the highest methodological standards, they are unlikely to be useful to decision-makers. Sample size calculations for these designs require allowance for clustering, time effects and repeated measures. METHODS We carried ...
متن کاملSimple sample size calculation for cluster-randomized trials.
BACKGROUND Cluster-randomized trials, in which health interventions are allocated randomly to intact clusters or communities rather than to individual subjects, are increasingly being used to evaluate disease control strategies both in industrialized and in developing countries. Sample size computations for such trials need to take into account between-cluster variation, but field epidemiologis...
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ژورنال
عنوان ژورنال: Statistics in Medicine
سال: 2016
ISSN: 0277-6715
DOI: 10.1002/sim.7028