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Vaccine effectiveness of the first dose of ChAdOx1 nCoV-19 and BNT162b2 against SARS-CoV-2 infection in residents of long-term care facilities in England (VIVALDI): a prospective cohort study.

Shrotri M, Krutikov M, Palmer T, Giddings R, Azmi B, Subbarao S, Fuller C, Irwin-Singer A, Davies D, Tut G, Lopez Bernal J, Moss P, Hayward A, Copas A, Shallcross L. Shrotri M, et al. Among authors: copas a. Lancet Infect Dis. 2021 Nov;21(11):1529-1538. doi: 10.1016/S1473-3099(21)00289-9. Epub 2021 Jun 23. Lancet Infect Dis. 2021. PMID: 34174193 Free PMC article.

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Sample size calculation for a stepped wedge trial.

Baio G, Copas A, Ambler G, Hargreaves J, Beard E, Omar RZ. Baio G, et al. Among authors: copas a. Trials. 2015 Aug 17;16:354. doi: 10.1186/s13063-015-0840-9. Trials. 2015. PMID: 26282553 Free PMC article. Review.

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Optimal design of cluster randomised trials with continuous recruitment and prospective baseline period.

Hooper R, Copas AJ. Hooper R, et al. Among authors: copas aj. Clin Trials. 2021 Apr;18(2):147-157. doi: 10.1177/1740774520976564. Epub 2021 Mar 8. Clin Trials. 2021. PMID: 33685241 Free PMC article.

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Stepped wedge randomised controlled trials: systematic review of studies published between 2010 and 2014.

Beard E, Lewis JJ, Copas A, Davey C, Osrin D, Baio G, Thompson JA, Fielding KL, Omar RZ, Ononge S, Hargreaves J, Prost A. Beard E, et al. Among authors: copas a. Trials. 2015 Aug 17;16:353. doi: 10.1186/s13063-015-0839-2. Trials. 2015. PMID: 26278881 Free PMC article. Review.

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Review of methods for handling confounding by cluster and informative cluster size in clustered data.

Seaman S, Pavlou M, Copas A. Seaman S, et al. Among authors: copas a. Stat Med. 2014 Dec 30;33(30):5371-87. doi: 10.1002/sim.6277. Epub 2014 Aug 4. Stat Med. 2014. PMID: 25087978 Free PMC article. Review.

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Using electronic patient records to assess the effect of a complex antenatal intervention in a cluster randomised controlled trial-data management experience from the DESiGN Trial team.

Relph S, Elstad M, Coker B, Vieira MC, Moitt N, Gutierrez WM, Khalil A, Sandall J, Copas A, Lawlor DA, Pasupathy D; DESIGN Trial team. Relph S, et al. Among authors: copas a. Trials. 2021 Mar 8;22(1):195. doi: 10.1186/s13063-021-05141-8. Trials. 2021. PMID: 33685512 Free PMC article. Clinical Trial.

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Linkage to HIV care following diagnosis in the WHO European Region: A systematic review and meta-analysis, 2006-2017.

Croxford S, Yin Z, Burns F, Copas A, Town K, Desai S, Skingsley A, Delpech V; OptTEST project. Croxford S, et al. Among authors: copas a. PLoS One. 2018 Feb 16;13(2):e0192403. doi: 10.1371/journal.pone.0192403. eCollection 2018. PLoS One. 2018. PMID: 29451875 Free PMC article. Review.

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Reporting and methodological quality of sample size calculations in cluster randomized trials could be improved: a review.

Rutterford C, Taljaard M, Dixon S, Copas A, Eldridge S. Rutterford C, et al. Among authors: copas a. J Clin Epidemiol. 2015 Jun;68(6):716-23. doi: 10.1016/j.jclinepi.2014.10.006. Epub 2014 Dec 15. J Clin Epidemiol. 2015. PMID: 25523375 Free article. Review.

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Superiority and non-inferiority: two sides of the same coin?

Dunn DT, Copas AJ, Brocklehurst P. Dunn DT, et al. Among authors: copas aj. Trials. 2018 Sep 17;19(1):499. doi: 10.1186/s13063-018-2885-z. Trials. 2018. PMID: 30223881 Free PMC article.

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Handling an uncertain control group event risk in non-inferiority trials: non-inferiority frontiers and the power-stabilising transformation.

Quartagno M, Walker AS, Babiker AG, Turner RM, Parmar MKB, Copas A, White IR. Quartagno M, et al. Among authors: copas a. Trials. 2020 Feb 6;21(1):145. doi: 10.1186/s13063-020-4070-4. Trials. 2020. PMID: 32029000 Free PMC article.

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