Fig. 2

Comparisons between desirable and current practice in the use of evidence synthesis methods in trial design. This is summarised by type of evidence synthesis method, among survey respondents involved in trial design to inform five aspects of trial design: whether a trial is needed (n = 84), choice of population (n = 82), choice of interventions (n = 82), choice of outcomes and follow-up time (n = 81), sample size (n = 81). Numbers displayed are percentages