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Open AccessProtocol

Protocol for the Process Evaluation of a Complex, Statewide Intervention to Reduce Salt Intake in Victoria, Australia

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The George Institute for Global Health, University of New South Wales, Sydney, NSW 2042, Australia
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Sydney School of Public Health, Faculty of Medicine, The University of Sydney, Sydney, NSW 2006, Australia
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The George Institute for Global Health, University of Oxford, Oxford OX1 3QX, UK
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Department of Epidemiology, Johns Hopkins University, Baltimore, MD 21218, USA
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Institute for Physical Activity and Nutrition, Deakin University, Geelong, VIC 3220, Australia
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Department of Health and Human Services, Melbourne, VIC 3000, Australia
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Victorian Health Promotion Foundation, Carlton, VIC 3053, Australia
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National Heart Foundation (Victorian Division), Melbourne, VIC 3000, Australia
*
Author to whom correspondence should be addressed.
Nutrients 2018, 10(8), 998; https://doi.org/10.3390/nu10080998
Received: 16 July 2018 / Revised: 24 July 2018 / Accepted: 27 July 2018 / Published: 30 July 2018
Systematic reviews of trials consistently demonstrate that reducing salt intake lowers blood pressure. However, there is limited evidence on how interventions function in the real world to achieve sustained population-wide salt reduction. Process evaluations are crucial for understanding how and why an intervention resulted in its observed effect in that setting, particularly for complex interventions. This project presents the detailed protocol for a process evaluation of a statewide strategy to lower salt intake in Victoria, Australia. We describe the pragmatic methods used to collect and analyse data on six process evaluation dimensions: reach, dose or adoption, fidelity, effectiveness, context and cost, informed by Linnan and Steckler’s framework and RE-AIM. Data collection methods include routinely collected administrative data; surveys of processed foods, the population, food industry and organizations; targeted campaign evaluation and semi-structured interviews. Quantitative and qualitative data will be triangulated to provide validation or context for one another. This process evaluation will contribute new knowledge about what components of the intervention are important to salt reduction strategies and how the interventions cause reduced salt intake, to inform the transferability of the program to other Australian states and territories. This protocol can be adapted for other population-based, complex, disease prevention interventions. View Full-Text
Keywords: sodium reduction; public health nutrition; hypertension; process evaluation; disease prevention; population interventions sodium reduction; public health nutrition; hypertension; process evaluation; disease prevention; population interventions
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Trieu, K.; Jan, S.; Woodward, M.; Grimes, C.; Bolam, B.; Nowson, C.; Reimers, J.; Davidson, C.; Webster, J. Protocol for the Process Evaluation of a Complex, Statewide Intervention to Reduce Salt Intake in Victoria, Australia. Nutrients 2018, 10, 998.

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