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Rapid response to:


Exercise therapy after corticosteroid injection for moderate to severe shoulder pain: large pragmatic randomised trial

BMJ 2010; 340 doi: (Published 28 June 2010) Cite this as: BMJ 2010;340:c3037

Rapid Response:

Devaluing the currency


We are very concerned that for a trial with a sample size of 232 the
BMJ accepts the descriptor 'large' in the title. This suggests a
benchmark for the size of pragmatic RCTs of rehabilitation interventions.
There are a number of published and ongoing trials with two or three times
as many participants and at least one with more than 10 times this many.
Surely it is only these definitive trials powered to show small between
group differences that should be described as large?

Competing interests:
None declared

Competing interests: No competing interests

12 July 2010
Robert J Froud
Research Fellow, Clinical Trials
Martin Underwood
Barts and the London School of Medicine and Dentistry, Queen Mary University of London, E12AT