Table 1

Characteristics of the included randomised controlled trial

Study name and fundingStudy designParticipants, settingExposureControlOutcomesNotes
Freemantle et al,13 2000,
funding by Warwickshire health authority
Randomised controlled trialAll 79 cardiovascular practices in Warwickshire participated in the trial 40 practices which received, in addition to what the control group received:
a letter from the chief executive of the health authoritypostgraduate educational allowance accreditationa letter from the pharmaceutical advisor 
39 practices which received:
practice guidelines routine marketing activities routine health authority advice
Proportion of prescriptions in line with the guidelines (behaviour)prescribing costs Time frame: October 1997–April 1998