Forest plot
Development
Feasibility
Evaluation · preliminary
Evaluation · definitive
Implementation
MRC–NIHR phases (Skivington et al., 2021) · square size ∝ weight · dashed line = 95% prediction interval
Stage-stratified pooled estimates
The methodological contribution of this platform: pooled estimates stratified by trial maturity, using the MRC–NIHR complex-intervention framework (Development → Feasibility → Evaluation → Implementation; Skivington et al., 2021). The Evaluation phase is sub-split into preliminary-efficacy and definitive/confirmatory trials so feasibility evidence is not conflated with confirmatory evidence.
Study details
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Study locations
Dot size reflects study count. Colour reflects dominant trial stage. The evidence base is heavily concentrated in the USA and UK.