Table 2.

Characteristics of reviews included in the narrative synthesis

Reference	Research design	Synthesis method	Population	Intervention	No. of data bases	Search period	Search restrictions	No. of included studies	AMSTAR 2 rating
Eykelenboom et al 201933	NRSI; RCT; mixed-methods studies; qualitative studies; surveys	Thematic synthesis and meta-analysis	Any individuals involved in the decision-making process (eg, policy makers, politicians, and officials of ministries) or any individuals potentially affected by a SSBs tax (ie, the public)	FP (taxes) on SSB’s	4	Earliest date up to November 2018	English language	37	CL
Mounsey et al 202049	NRSI; models	Narrative synthesis	National economies	FP (taxes) on SSB’s and energy-dense foods	7	Earliest date up to November 2018 (1 article from 2019 included after search date)	English language	11	CL
Dodd et al 202047	NRSI; models; experiments; surveys	Narrative synthesis	Any population, any age, any setting, any country	FP (taxes) on salt and foods high in salt	12	January 2000 to October 2019	None	18	CL
Niebylski et al 201548	NRSI; RCT; models; reviews; experiments; surveys	Narrative synthesis	Adults and children, any setting, in Western Europe, Canada, United States, Australia, and New Zealand	FP (taxes and subsidies) to promote healthy diet	4	June 2003 to November 2013 (Google Scholar – June and November 2013)	Peer-reviewed; English language	78	CL

Note: the populations have been described as they were described by the review authors. Where the population inclusion criteria were not described in the review, it was assumed that “any” population, age, setting, or country had the potential to be included. Abbreviations: CL, critically low; FP, fiscal and pricing policies; NRSIs, non-random studies of interventions; RCT, randomized controlled trials; SSB, sugar-sweetened beverages.