Copas AJ - Search Results

1

Combined models for pre- and post-treatment longitudinal biomarker data: an application to CD4 counts in HIV-patients.

Stirrup OT, Babiker AG, Copas AJ. Stirrup OT, et al. Among authors: copas aj. BMC Med Res Methodol. 2016 Sep 15;16:121. doi: 10.1186/s12874-016-0187-2. BMC Med Res Methodol. 2016. PMID: 27633882 Free PMC article.

2

The long-term effects of a peer-led sex education programme (RIPPLE): a cluster randomised trial in schools in England.

Stephenson J, Strange V, Allen E, Copas A, Johnson A, Bonell C, Babiker A, Oakley A; RIPPLE Study Team. Stephenson J, et al. PLoS Med. 2008 Nov 25;5(11):e224; discussion e224. doi: 10.1371/journal.pmed.0050224. PLoS Med. 2008. PMID: 19067478 Free PMC article. Clinical Trial.

3

Discordant responses on starting highly active antiretroviral therapy: suboptimal CD4 increases despite early viral suppression in the UK Collaborative HIV Cohort (UK CHIC) Study.

Gilson RJ, Man SL, Copas A, Rider A, Forsyth S, Hill T, Bansi L, Porter K, Gazzard B, Orkin C, Pillay D, Schwenk A, Johnson M, Easterbook P, Walsh J, Fisher M, Leen C, Anderson J, Sabin CA; UK Collaborative HIV Cohort Study Group. Gilson RJ, et al. HIV Med. 2010 Feb;11(2):152-60. doi: 10.1111/j.1468-1293.2009.00755.x. Epub 2009 Sep 1. HIV Med. 2010. PMID: 19732175 Free article.

4

High percentage of recent HIV infection leading to onward transmission in Odessa, Ukraine associated with young adults.

Simmons R, Semenenko I, Tolpina M, Tereschenko R, Kotlik L, Zasyptka L, Murphy G, McKinney E, Copas A, Malyuta R, Porter K; CASCADE collaboration in EuroCoord. Simmons R, et al. AIDS Behav. 2014 Feb;18(2):411-8. doi: 10.1007/s10461-013-0518-9. AIDS Behav. 2014. PMID: 23686153

5

Optimal CD4 count for initiating HIV treatment: impact of CD4 observation frequency and grace periods, and performance of dynamic marginal structural models.

Ewings FM, Ford D, Walker AS, Carpenter J, Copas A. Ewings FM, et al. Epidemiology. 2014 Mar;25(2):194-202. doi: 10.1097/EDE.0000000000000043. Epidemiology. 2014. PMID: 24487204 Free PMC article.

6

Fractional Brownian motion and multivariate-t models for longitudinal biomedical data, with application to CD4 counts in HIV-positive patients.

Stirrup OT, Babiker AG, Carpenter JR, Copas AJ. Stirrup OT, et al. Among authors: copas aj. Stat Med. 2016 Apr 30;35(9):1514-32. doi: 10.1002/sim.6788. Epub 2015 Nov 10. Stat Med. 2016. PMID: 26555755 Free PMC article.

7

Early virological response to HIV treatment: can we predict who is likely to experience subsequent treatment failure? Results from an observational cohort study, London, UK.

Brima N, Lampe FC, Copas A, Gilson R, Williams I, Johnson MA, Phillips AN, Smith CJ. Brima N, et al. J Int AIDS Soc. 2017 Aug 30;20(1):21567. doi: 10.7448/IAS.20.21567. J Int AIDS Soc. 2017. PMID: 28853518 Free PMC article.

8

Predictors of CD4 cell recovery following initiation of antiretroviral therapy among HIV-1 positive patients with well-estimated dates of seroconversion.

Stirrup OT, Copas AJ, Phillips AN, Gill MJ, Geskus RB, Touloumi G, Young J, Bucher HC, Babiker AG; CASCADE Collaboration in EuroCoord. Stirrup OT, et al. Among authors: copas aj. HIV Med. 2018 Mar;19(3):184-194. doi: 10.1111/hiv.12567. Epub 2017 Dec 1. HIV Med. 2018. PMID: 29230953 Free PMC article.

9

Human papillomavirus infection: protocol for a randomised controlled trial of imiquimod cream (5%) versus podophyllotoxin cream (0.15%), in combination with quadrivalent human papillomavirus or control vaccination in the treatment and prevention of recurrence of anogenital warts (HIPvac trial).

Murray ML, Meadows J, Doré CJ, Copas AJ, Haddow LJ, Lacey C, Jit M, Soldan K, Bennett K, Tetlow M, Nathan M, Gilson R. Murray ML, et al. Among authors: copas aj. BMC Med Res Methodol. 2018 Nov 6;18(1):125. doi: 10.1186/s12874-018-0581-z. BMC Med Res Methodol. 2018. PMID: 30400777 Free PMC article. Clinical Trial.

10

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. 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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