Dear Matt,
A very good evening from the East of England.
You might find this paper of some relevance regarding your above posting. I
found Table 1 quite interesting.
Factors that can affect the external validity of Randomised controlled
trials.
Full text @
http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=1488890&blobtype=pdf
Warm regards & very best wishes,
Badri
Dr P Badrinath MD BS M.Phil MPH FFPH PhD (Cantab)
Consultant in Public Health Medicine & Affiliated Clinical Lecturer
Suffolk PCT & University of Cambridge
Rushbrook house, Paper mill lane, Bramford, Ipswich, IP8 4DE, Suffolk, UK
http://myprofile.cos.com/badrishanthi
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