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Sally Kerry


Reader in Medical Statistics

Telephone: 020 7882 7208


Sally studied Mathematics and Statistics at Reading University and Medical Statistics at the London School of Hygiene and Tropical Medicine. In 1991 she joined the department of General Practice at St. George’s Hospital Medical School, as one of the first statisticians to specialise in primary care. During this time she developed an interest in cluster randomised trials. Working with Professor Martin Bland, she wrote a series of statistics notes in the BMJ to provide researchers with accessible information and practical solutions to the issues of sample size and analysis.

She has collaborated on a number of randomised trials in primary care, both individually and cluster randomised. In 2000-2004 she collaborated on a cluster randomised trial of an educational intervention to reduce blood pressure by reducing dietary salt in Ghana.  In 2004 she published a systematic review of home blood pressure monitoring to improve blood pressure control and is currently completing a trial of home blood pressure monitors among stroke patients.

She has co-authored two books: ‘Presenting Statistics from Proposal to Publication’ with Janet Peacock, written to help researchers clearly present statistics in peer review publications, thesis and grant applications. ‘A Practical Guide to Cluster Randomised Trials in Health Services Research’ with Sandra Eldridge will be published in early 2012.

In 2010 she joined the Pragmatic Clinical Trials Unit as senior statistician.

Co-authoring a book on Cluster Randomised Trial with Sandra Eldridge


Recent and ongoing research projects:

  • Home blood pressure monitoring among stroke patients
  • Anti epileptic drug monitoring in pregnancy trial (EMPiRE)
  • Development and validation of a prediction risk model for risk of complications in early onset pre-eclampsia (PREP)


Research Interests:

Sally’s main research interests are in the design of cluster randomised trials and improving the understanding and reporting of statistics among researchers.


Peacock JL, Sauzet O, Ewing SM, Kerry SM. Dichotomizing continuous data while retaining statistical power. Statistics in Medicine 2012

Atherton H, Oakeshott P,  Aghaizu A, Hay P, Kerry S. Use of an online questionnaire for follow up of young female students recruited to a randomised controlled trial of chlamydia screening.  J Epid Community Health 2010;64:580-584

Harris T, Kerry S, Victor C, Ekelund U, Woodcock A, Illife S, Whincup P, Beighton C, Ussher M, David L, Brewin D, Adams F, Rogers A, Cook D. Randomised controlled trial of a complex intervention by primary care nurses to increase walking in patients aged 60 – 74 years: protocol of the PACE-Lift (Pedometer Accelerometer Consultation Evaluation- Lift) Trial. BMC Public Health 2013,13:5

Kerry SM, Markus HS, Khong TK, Cloud GC , Ibison J, Tulloch D, Coster D, Oakeshott P. Home blood pressure monitoring with nurse-led telephone support in hypertensive stroke patients: a community-based randomised controlled trial CMAJ November 5, 2012, doi: 10.1503/cmaj.120832

Ovaisi S, Ibison J, Leontowitsch M, Cloud GC, Oakeshott P, Kerry S. A qualitative study of stroke patients perceptions of home blood
pressure monitoring. BJGP 2011 ;DOI:10.3399/bjgp11X593893s

Oakeshott P,  Aghaizu A, Hay P, Reid F, Kerry S, Atherton H, Simms I, Taylor-Robinson D, Dohn B, Jensen JS Is Mycoplasma genitalium in women "the new chlamydia"? Community based prospective cohort study. Clin Infect Dis 2010;51(10):000-000 online

Oakeshott P, Kerry SM, Aghaizu A, Atherton H, Hay S, Taylor-Robinson D, Simms I, Hay P.  Screening for Chlamydia trachomatis to prevent pelvic inflammatory disease: the POPI (prevention of pelvic infection) trial. BMJ 2010;340:c1642

Eldridge S. Kerry S. Torgerson DJ. Bias in identifying and recruiting participants in cluster randomised trials: what can be done? BMJ 2009. 339:b4006

Strazzullo P, Kerry SM, Barbato A, Versiero M,  D’elia L and Cappuccio FP. Do statins reduce blood pressure? A meta-analysis of randomised controlled trials. Hypertension 2007;49:792-798

Eldridge S, Ashby D, Kerry S. Sample size for cluster randomised trials: effect of coefficient of variation of cluster size and analysis method IJE 2006; 35(5):1292-300

Cappuccio F, Kerry SM, Forbes L, Donald A. Blood pressure control by home monitoring:a meta-analysis of randomised trials. BMJ 2004:329;145-8

Pickup J,  Mattock M, Kerry S. Glycaemic control with continuous subcutaneous insulin infusion (CSII) compared to intensive insulin injection therapy in type 1 diabetes: meta-analysis of randomised controlled trials.  BMJ 2002;324:705-8

Bland JM, Kerry SM. Statistics notes. Weighted comparison of means. BMJ  1998;316(7125):129

Kerry SM, Bland JM. Analysis of a trial randomised in clusters.  BMJ  1998;316(7124):54

Kerry SM, Bland JM. Sample size in cluster randomisation. BMJ  1998;316(7130):549

Kerry SM, Bland JM. The intracluster correlation coefficient in cluster randomisation. BMJ  1998;316(7142):1455

Bland JM, Kerry SM. Statistics notes. Trials randomised in clusters. BMJ  1997;315(7108):600

View all Sally Kerry's Research Publications at:

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