- Oral presentation
- Open Access
Assessing the effectiveness of a ‘site visit’ on recruitment rates in a multicentre randomised trial: SWAT-1
© Smith et al. 2015
Published: 16 November 2015
The SWAT (Studies within a Trial) programme, established by the All-Ireland Hub for Trials Methodology Research in collaboration with the Medical Research Council Network of Hubs in the UK and others, is developing methods to resolve uncertainties about trial conduct through embedded research. SWAT-1 provides an initial example.
To evaluate the effects of a site visit on recruitment rates in a multi-centre randomised trial.
Using the SWAT-1 design, a before-and-after comparison used the date of the site visit as the time point for the intervention. Site A received the site visit. Sites B and C did not receive it and acted as the controls. The primary outcomes were the difference in recruitment in each site from 1 and 3 months pre-intervention to 1 and 3 months post-intervention.
Recruitment rates increased in Site A post-intervention (17% and 14% percentage point increases at 1 and 3 months, respectively). No differences in recruitment occurred in Site B or in Site C. At 3 months post-intervention, a significant difference was detected in favour of higher recruitment in A compared to B+C (34% versus 25%; odds ratio 1.57, 95% confidence interval 1.09-2.26). These findings suggest that recruitment might increase from 2 participants per week before the site visit to 4-5 per week after it.
This initial example of a SWAT provides evidence that a site visit increases recruitment rates in a trial. Further SWAT-1s are required to substantiate these findings and to examine the effects in different trials in different settings.
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.