What is a cluster crossover?
In a cluster randomised crossover (CRXO) design, a sequence of interventions is assigned to a group, or ‘cluster’ of individuals. Each cluster receives each intervention in a separate period of time, forming ‘cluster-periods’.
What is cluster level analysis?
Cluster level analysis The traditional approach to the analysis of cluster randomized trials has been to calculate a summary measure for each cluster, such as a cluster mean or proportion.
What is a randomised crossover design?
A crossover randomised controlled trial ( RCT ) is a specific type of RCT where you assess 2 or more interventions. In this design, all participants receive all the interventions, but the order in which they get the interventions is randomised.
What is a crossover clinical trial?
Listen to pronunciation. (KROS-oh-ver STUH-dee) A type of clinical trial in which all participants receive the same two or more treatments, but the order in which they receive them depends on the group to which they are randomly assigned.
What is a consort diagram?
The CONSORT diagram is a simple flow diagram showing the enrollment of subjects, their allocation to treatment, disposition status and how they are analysed in the trial. The layout of a CONSORT diagram depends on the study design.
How does the cluster randomised crossover trial work?
The allocation of interventions to patients in the stratified, multicentre, parallel-group, individually randomised trial (IRCT) design, the parallel-group cluster randomised trial (CRCT) design, and the CRXO design are shown in Fig. 1. In each design, each intervention is given for one 12-month period.
How is the Order of interventions randomized in a crossover design?
In a standard crossover design the order of the interventions is randomized for each cluster and a time period (called the “washout” period) is often included between the two interventions so that the first intervention does not affect the second. Analysis of a standard crossover design focuses on within-cluster comparisons using a paired t -test.
Why are stepped wedge clusters used in randomized trials?
Although the stepped wedge design extends the length of a randomized trial due to the presence of multiple time intervals, the nature of the design may be beneficial in certain settings. In a parallel or traditional crossover design, the intervention must be implemented in half of the total clusters simultaneously.
Which is a variation of the parallel group cluster randomized design?
A variation of the parallel group cluster randomized design is the cluster randomized crossover design (CRXO). In the CRXO design each cluster receives each intervention at least once in separate periods of time [3, 4].