Reporting of cluster randomised crossover trials: extension of the CONSORT 2010 statement with explanation and elaboration.

This article presents the CONSORT (consolidated standards of reporting trials) extension for cluster randomised crossover trials. A cluster randomised crossover trial involves randomisation of groups of individuals (known as clusters) to different sequences of interventions over time. The design has gained popularity in settings where cluster randomisation is required because it can largely overcome the loss in power due to clustering in parallel cluster trials.

Place-based household vouchers for locally supplied fruit and vegetables: the Fresh Street pilot cluster randomised controlled trial.

Background: Households in areas of socio-economic deprivation are more likely to consume diets low in fruit and vegetables. Fresh Street is a place-based fruit and vegetable voucher scheme with vouchers redeemable with local independent (non-supermarket) vendors. Paper vouchers are offered to all households in a geographical area regardless of household type, size, or income with no requirement to demonstrate need.

The Early Youth Engagement (EYE-2) intervention in first-episode psychosis services: pragmatic cluster randomised controlled trial and cost-effectiveness evaluation.

Background: Early intervention in psychosis (EIP) services improve outcomes for young people, but approximately 30% disengage.

Aims: To test whether a new motivational engagement intervention would prolong engagement and whether it was cost-effective.

Method: We conducted a multicentre, single-blind, parallel-group, cluster randomised controlled trial involving 20 EIP teams at five UK National Health Service (NHS) sites.