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Wolfson Institute of Population Health

Professor Sandra Eldridge, PhD, FRCGP(Hons)


Honorary Professor of Biostatistics



Sandra is Professor of Biostatistics and Director of the UKCRC Registered Pragmatic Clinical Trials Unit at Barts and The London School of Medicine and Dentistry. She is also Associate Dean for Strategic Developments within the School and the lead for Equality, Diversity and Inclusion.

Sandra is also an Honorary Fellow of the Royal College of General Practitioners, an NIHR Senior Investigator, fellow of the Royal Statistical Society and of the Higher Education Academy, and a member of the Society for Academic Primary Care. She currently sits on the NIHR Clinical Trials Unit Standing Advisory Committee. Between 2007 and 2017, she was joint lead of the Centre for Primary Care and Public Health, and between 2008 and 2018, she jointly led the east London arm of the NIHR Research Design Service. She sat on the Royal Statistical Society’s Council between 2015 and 2018 and led the setting up of its Primary Health Care Study Group, which ran between 2002 and 2017. She was a member of the Society for Academic Primary Care Executive between 2011 and 2017. She has sat on various NIHR funding panels including Programme Grants for Applied Research and HTA.

Since 2017, Sandra has stepped back from her responsibility as Centre lead and some other responsibilities to train for ordination in the Church of England is now an Anglican Priest alongside her academic job.


Topics for PhD supervision:

Methods in pragmatic trials especially cluster randomised trials, methods for complex interventions


Research Interests:

Research Group: Pragmatic Clinical Trials Unit

Sandra has an international reputation as a trial statistician with particular interests in cluster randomised trials, pilot and feasibility studies and pragmatic trials. She currently leads the collaboration on pilot and feasibility studies that developed the CONSORT extension for pilot trials, and leads the adaptation of the new Cochrane Risk of Bias tool to cluster randomised trials. In 2012, she published (together with Sally Kerry), the book “A practical guide to cluster randomised trials in health services research.” She collaborates widely, has over 200 peer-reviewed publications, and currently holds about £25 million of research grants as principal investigator or co-applicant.


Eldridge S, Kerry S, Torgerson DJ. Bias in identifying and recruiting participants in cluster randomised trials: what can be done? BMJ. 2009 Oct 9;339.

Eldridge S, Ashby D, Bennett C, Wakelin M, Feder G. Internal and external validity of cluster randomised trials: systematic review of recent trials. BMJ 2008; 336(7649):876-880.
Eldridge SM, Ashby D, Kerry S. Sample size calculations for cluster randomized trials: effect of coefficient of variation of cluster size and analysis method. Int. J. Epidemiol. 2006 Oct;35(5):1292-300

Eldridge S, Spencer A, Cryer C, Parsons S, Underwood M, Feder G. Modelling a complex intervention is an important precursor to trial design: lessons from studying an intervention to reduce falls-related injuries in older people. J Health Serv.Res Policy 2005;10:133-142.

Eldridge SM. Ashby D. Feder GS. Informed patient consent to participation in cluster randomised trials: an empirical exploration of trials in primary care. Clinical Trials 2005; 2: 91-98

Eldridge SM, Ashby Barbanel D, Eldridge S, Griffiths C. Can a self-management programme delivered by a community pharmacist improve asthma control? A randomised trial. Thorax 2003;58:851-4.

View all Sandra Eldridge's Research Publications at:

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