Occurrence of CuCl emission in volcanic flames [Hawaii]

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ID: 296002
1960
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Abstract

Abstract

Objectives

To determine the effectiveness of sending Christmas cards to participants in randomised controlled trials to increase retention rate at follow-ups, and to explore the feasibility of doing a study within a trial (SWAT) across multiple host trials simultaneously.

Design

Randomised SWAT conducted simultaneously across eight host trials.

Setting

Eight randomised controlled trials researching various areas including surgery and smoking cessation.

Participants

3223 trial participants who were still due at least one follow-up from their host randomised controlled trial.

Intervention

Participants were randomised (1:1, separately by each host trial) to either received a Christmas card in mid-December 2019 or to not receive a card.

Main outcome measure

Proportion of participants completing their next follow-up (retention rate) within their host randomised controlled trial.

Results

1469 participants (age 16-94 years; 70% (n=1033) female; 96% (813/847) white ethnicity) across the eight host randomised controlled trials were involved in the analysis (cut short owing to covid-19). No evidence was found of a difference in retention rate between the two arms for any of the host trials when analysed separately or when the results were combined (85.3% (639/749) for cards versus 85.4% (615/720) for no card; odds ratio 0.96, 95% confidence interval 0.71 to 1.29; P=0.77). No difference was observed when comparing just participants who were due a follow-up in the 30 days after receiving the card (odds ratio 0.96, 0.42 to 2.21). No evidence of a difference in time to complete the questionnaire was found (hazard ratio 1.01, 95% confidence interval 0.91 to 1.13; P=0.80). These results were robust to post hoc sensitivity analyses. The cost of this intervention was £0.76 (€0.91; $1.02) per participant, and it will have a carbon footprint of approximately 140 g CO2 equivalent per card. One benefit of this approach was the need to only submit one ethics application.

Conclusions

Sending Christmas cards to participants in randomised controlled trials does not increase retention. Undertaking a SWAT within multiple randomised controlled trials at the same time is, however, possible. This approach should be used more often to build an evidence base to support selection of recruitment and retention strategies. Although no evidence of a boost to retention was found, embedding a SWAT in multiple host trials simultaneously has been shown to be possible.

Study registration

SWAT repository https://www.qub.ac.uk/sites/TheNorthernIrelandNetworkforTrialsMethodologyResearch/FileStore/Filetoupload,846275,en.pdf#search=SWAT%2082.
Reference Key
openalex_W2331165347 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors K. Murata
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Journal american journal of science
Year 1960
DOI
10.2475/ajs.258.10.769
URL
https://doi.org/10.2475/ajs.258.10.769
Keywords Keywords not found

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