Evidence based medicine: does it make a difference?

doi:10.1136/bmj.330.7482.93-a

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Evidence base is weak and comes too late for evidence based policy making

Tim Wilson, general practitioner (Tim.wilson@gp-k84036.nhs.uk)

Mill Stream Surgery, Benson, Oxfordshire OX10 6RL

EDITOR—Muir Gray says that evidence based policy making is about taking decisions based on evidence and the needs and values of the population.1 Surely one of the major barriers to better evidence based policy is that the evidence base is weak and too late.

In clinical practice, evidence in randomised controlled trials often uses selected groups of patients, excluding …