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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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Evaluation of respondent-driven sampling.

McCreesh N, Frost SD, Seeley J, Katongole J, Tarsh MN, Ndunguse R, Jichi F, Lunel NL, Maher D, Johnston LG, Sonnenberg P, Copas AJ, Hayes RJ, White RG. McCreesh N, et al. Among authors: copas aj. Epidemiology. 2012 Jan;23(1):138-47. doi: 10.1097/EDE.0b013e31823ac17c. Epidemiology. 2012. PMID: 22157309 Free PMC article.

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Imiquimod versus podophyllotoxin, with and without human papillomavirus vaccine, for anogenital warts: the HIPvac factorial RCT.

Gilson R, Nugent D, Bennett K, Doré CJ, Murray ML, Meadows J, Haddow LJ, Lacey C, Sandmann F, Jit M, Soldan K, Tetlow M, Caverly E, Nathan M, Copas AJ. Gilson R, et al. Among authors: copas aj. Health Technol Assess. 2020 Sep;24(47):1-86. doi: 10.3310/hta24470. Health Technol Assess. 2020. PMID: 32975189 Free PMC article. Clinical Trial.

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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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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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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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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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How important is randomisation in a stepped wedge trial?

Hargreaves JR, Prost A, Fielding KL, Copas AJ. Hargreaves JR, et al. Among authors: copas aj. Trials. 2015 Aug 16;16:359. doi: 10.1186/s13063-015-0872-1. Trials. 2015. PMID: 26275907 Free PMC article.

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Analysis and reporting of stepped wedge randomised controlled trials: synthesis and critical appraisal of published studies, 2010 to 2014.

Davey C, Hargreaves J, Thompson JA, Copas AJ, Beard E, Lewis JJ, Fielding KL. Davey C, et al. Among authors: copas aj. Trials. 2015 Aug 17;16:358. doi: 10.1186/s13063-015-0838-3. Trials. 2015. PMID: 26278667 Free PMC article. Review.

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