Evaluation of a Coding System for a Smartphone Based Visual Food Record

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ARNOLD, Sabine, 2015. Evaluation of a Coding System for a Smartphone Based Visual Food Record [Master thesis]. Konstanz: Universität Konstanz

@mastersthesis{Arnold2015Evalu-43193, title={Evaluation of a Coding System for a Smartphone Based Visual Food Record}, year={2015}, address={Konstanz}, school={Universität Konstanz}, author={Arnold, Sabine} }

<rdf:RDF xmlns:dcterms="http://purl.org/dc/terms/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bibo="http://purl.org/ontology/bibo/" xmlns:dspace="http://digital-repositories.org/ontologies/dspace/0.1.0#" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:void="http://rdfs.org/ns/void#" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > <rdf:Description rdf:about="https://kops.uni-konstanz.de/rdf/resource/123456789/43193"> <dc:creator>Arnold, Sabine</dc:creator> <dc:language>eng</dc:language> <foaf:homepage rdf:resource="http://localhost:8080/jspui"/> <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/rdf/resource/123456789/43"/> <dc:rights>terms-of-use</dc:rights> <bibo:uri rdf:resource="https://kops.uni-konstanz.de/handle/123456789/43193"/> <dcterms:abstract xml:lang="eng">Among available dietary assessment tools the smartphone stands out in up-to-date measurement but requires further development. This study used data from Renner et al.’s (2015) SmartFood study to test the reliability of the smartphone based visual food record Renner et al. (2015) developed for Germany. In the SmartFood study participants photographed their diet using a smartphone within everyday living conditions over eight days. To determine the coding system’s reliability, two coders independently coded all 269 digital food images from 10 participants (six males, four females; age 30–74 years). Renner et al.’s (2015) coding system, comprising a food atlas (digital booklet with food images), and the nutritional software OptiDiet© were used to analyze the visual food record. As intercoder reliability index Krippendorff’s alpha was calculated to measure coder agreement. Across all participants’ meals, reliability was medium to high with α = .71, SD = 0.17, 95% CI [.59, .84] for food weight, α = .76, SD = 0.11, 95% CI [.69, .84] for food labeling, and α = .67, SD = 0.08, 95% CI [.59, .72] for food nutrients. Reliability varied in dependence of participant and nutrient type but was not significantly affected by the coders. The results support the coding system as a promising tool for analyzing smartphone based visual food records. To further develop the coding system, the food atlas should be extended with more images and the coding guidelines revised. Finally, a validation study is required.</dcterms:abstract> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2018-09-07T06:58:22Z</dcterms:available> <dcterms:issued>2015</dcterms:issued> <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/rdf/resource/123456789/43"/> <dc:contributor>Arnold, Sabine</dc:contributor> <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/> <dcterms:hasPart rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/43193/3/Arnold_2-1gs5h7mujjnv38.pdf"/> <dcterms:title>Evaluation of a Coding System for a Smartphone Based Visual Food Record</dcterms:title> <dspace:hasBitstream rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/43193/3/Arnold_2-1gs5h7mujjnv38.pdf"/> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2018-09-07T06:58:22Z</dc:date> <dcterms:rights rdf:resource="https://rightsstatements.org/page/InC/1.0/"/> </rdf:Description> </rdf:RDF>

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