Table 1. Included studies by policy approach.

Policy approach	Description*	Studies
Regulatory interventions	Establishing rules or principles of behaviour or practice	[23–49]
Guideline interventions	Creating documents that recommend or mandate practice	[50–67]
Communication interventions	Using print, electronic, telephonic, or broadcast media	[68–84]
Legislation interventions	Making or changing laws	[85–87]
Service provision interventions	Delivering a service	[88]
Environmental/social planning interventions	Designing or controlling the physical or social environment	None
Fiscal interventions	Using the tax system and other financial measures to reduce or increase the financial cost	[89–91]

*Policy approach descriptions from the Behaviour Change Wheel framework [22].