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• W2755819076 abstract "Abstract The limitations for self-reporting of dietary patterns are widely recognised as a major vulnerability of FFQ and the dietary screeners/scales derived from FFQ. Such instruments can yield inconsistent results to produce questionable interpretations. The present article discusses the value of psychometric approaches and standards in addressing these drawbacks for instruments used to estimate dietary habits and nutrient intake. We argue that a FFQ or screener that treats diet as a ‘latent construct’ can be optimised for both internal consistency and the value of the research results. Latent constructs, a foundation for item response theory (IRT)-based scales (e.g. Patient Reported Outcomes Measurement Information System) are typically introduced in the design stage of an instrument to elicit critical factors that cannot be observed or measured directly. We propose an iterative approach that uses such modelling to refine FFQ and similar instruments. To that end, we illustrate the benefits of psychometric modelling by using items and data from a sample of 12 370 Soldiers who completed the 2012 US Army Global Assessment Tool (GAT). We used factor analysis to build the scale incorporating five out of eleven survey items. An IRT-driven assessment of response category properties indicates likely problems in the ordering or wording of several response categories. Group comparisons, examined with differential item functioning (DIF), provided evidence of scale validity across each Army sub-population (sex, service component and officer status). Such an approach holds promise for future FFQ." @default.
• W2755819076 created "2017-09-25" @default.
• W2755819076 creator A5026701284 @default.
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• W2755819076 date "2017-09-13" @default.
• W2755819076 modified "2023-10-14" @default.
• W2755819076 title "Using item response theory to address vulnerabilities in FFQ" @default.
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• W2755819076 doi "https://doi.org/10.1017/s0007114517002215" @default.
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• W2755819076 hasPublicationYear "2017" @default.
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