| Participants |
| Include |
Exclude |
| Studies for all age groups from all populations, from high-, middle- and low-income countries |
Studies on animals, cells and pregnant women |
| Interventions |
| Systematic Reviews and primary studies evaluating the effects of actions to promote salt reduction by government policy or adopted in specific real or experimental settings |
Studies evaluating the effect of a general or specific diet |
| Comparators |
| Systematic and non-systematic reviews where actions to promote salt reduction were evaluated or compared |
No comparisons of different actions to promote salt reduction presented |
| Outcomes |
| Primary outcome of interest was dietary salt intake (g/day). Studies including urinary sodium excretion as an outcome were converted to g/day. Secondary outcomes included changes in clinical/physiological indicators related to NCDs and behaviours associated with a healthy diet |
Process evaluations reporting on implementation of interventions/policies without any quantitative outcome data; feasibility or acceptability without an assessment or primary outcomes (intake); studies on individuals as opposed to populations; data on cost only and BMI
|
| Study design |
| Primary studies, RCTs, Systematic Reviews (SRs), empirical observational studies, natural experiments, and modelling studies, secondary analysis, and before vs. after interventions |
Commentary/opinion articles and purely qualitative evaluations with no quantitative assessment |
