Behavior change technique coding and synthesis
We used the standardized reporting BCT Taxonomy v1 (BCTTv1) from Michie and colleagues (All coders (BJJ, SP, SM, KF) completed the open-access University College London BCTTv1 online training (Published and unpublished intervention materials from the RCT and scale-up (such as session facilitator guides, newsletters, handouts, videos, app) were coded (detailed in the The level of agreement between independent coders' BCT coding was assessed using prevalence-adjusted and bias-adjusted kappa (PABAK) to account for the high prevalence of negative agreement between coders (i.e., when both agree that a BCT is not present) (