Randomised evaluation of pre-notification of trial participants before self-report outcome data collection to improve retention: SWAT86

Sutton, CJ, Cotterill, S, Forshaw, D, Rhodes, S, Haig, A and Hammond, A ORCID: https://orcid.org/0000-0002-5266-9991 2022, 'Randomised evaluation of pre-notification of trial participants before self-report outcome data collection to improve retention: SWAT86' , Research Methods in Medicine & Health Sciences .

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Abstract

Background Retention is considered the second highest trial methods priority in the UK after recruitment. There is limited evidence on whether notifying trial participants that a follow-up questionnaire will be sent soon (‘pre-notification’) affects retention. Methods This Study Within a Trial (SWAT) evaluated whether sending a pre-notification letter or email around 2 weeks before sending a self-report questionnaire increased retention, in terms of provision of the host trial primary outcome. The SWAT was a randomised, two-arm, parallel-design (1:1 allocation ratio) trial, controlled by ‘no pre-notification letter’. It was embedded within the WORKWELL host trial, which evaluated the impact of job retention vocational rehabilitation on work-related and health-related outcomes of employed people with inflammatory arthritis. The SWAT primary outcome was a valid response for the WORKWELL primary outcome. Results Two hundred forty-four trial participants took part in the SWAT. All were included in the analysis. Among those sent a pre-reminder, 100/121 (83%) provided a valid response for the WORKWELL primary outcome, compared to 97/123 (79%) of those not sent a pre-reminder. The estimated adjusted odds ratio was 1.28 (95% confidence interval 0.67–2.42), with a risk difference of 3.8% (95% CI -6.1 to 13.6%), favouring the prereminder. The estimated intervention cost per additional participant retained was £53.42, and the total cost per additional participant retained was £46.52. Conclusion Researchers may have a small improvement in trial retention by using pre-notification. The cost per additional participant retained is relatively low. However, further evaluations are merited.

Item Type: Article
Schools: Schools > School of Health and Society > Centre for Health Sciences Research
Journal or Publication Title: Research Methods in Medicine & Health Sciences
Publisher: Sage
ISSN: 2632-0843
Funders: Medical Research Council (MRC)
Depositing User: Professor Alison Hammond
Date Deposited: 12 May 2022 10:18
Last Modified: 17 Aug 2022 09:47
URI: https://usir.salford.ac.uk/id/eprint/63919

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