Application and interpretation of multiple statistical tests to evaluate validity of dietary intake assessment methods

 

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dc.contributor.author Lombard, Martani en_ZA
dc.contributor.author Steyn, Nelia en_ZA
dc.contributor.author Charlton, Karen en_ZA
dc.contributor.author Senekal, Marjanne en_ZA
dc.date.accessioned 2015-11-04T11:45:41Z
dc.date.available 2015-11-04T11:45:41Z
dc.date.issued 2015 en_ZA
dc.identifier.citation Lombard, M. J., Steyn, N. P., Charlton, K. E., & Senekal, M. (2015). Application and interpretation of multiple statistical tests to evaluate validity of dietary intake assessment methods. Nutrition journal, 14(1), 40. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/14657
dc.identifier.uri http://dx.doi.org/10.1186/s12937-015-0027-y
dc.description.abstract BACKGROUND:Several statistical tests are currently applied to evaluate validity of dietary intake assessment methods. However, they provide information on different facets of validity. There is also no consensus on types and combinations of tests that should be applied to reflect acceptable validity for intakes. We aimed to 1) conduct a review to identify the tests and interpretation criteria used where dietary assessment methods was validated against a reference method and 2) illustrate the value of and challenges that arise in interpretation of outcomes of multiple statistical tests in assessment of validity using a test data set. METHODS: An in-depth literature review was undertaken to identify the range of statistical tests used in the validation of quantitative food frequency questionnaires (QFFQs). Four databases were accessed to search for statistical methods and interpretation criteria used in papers focusing on relative validity. The identified tests and interpretation criteria were applied to a data set obtained using a QFFQ and four repeated 24-hour recalls from 47 adults (18-65 years) residing in rural Eastern Cape, South Africa. RESULTS: 102 studies were screened and 60 were included. Six statistical tests were identified; five with one set of interpretation criteria and one with two sets of criteria, resulting in seven possible validity interpretation outcomes. Twenty-one different combinations of these tests were identified, with the majority including three or less tests. Coefficient of correlation was the most commonly used (as a single test or in combination with one or more tests). Results of our application and interpretation of multiple statistical tests to assess validity of energy, macronutrients and selected micronutrients estimates illustrate that for most of the nutrients considered, some outcomes support validity, while others do not. CONCLUSIONS: One to three statistical tests may not be sufficient to provide comprehensive insights into various facets of validity. Results of our application and interpretation of multiple statistical tests support the value of such an approach in gaining comprehensive insights in different facets of validity. These insights should be considered in the formulation of conclusions regarding validity to answer a particular dietary intake related research question. en_ZA
dc.language.iso eng en_ZA
dc.publisher Biomed Central Ltd en_ZA
dc.rights This is an Open Access article distributed under the terms of the Creative Commons Attribution License en_ZA
dc.rights.uri http://creativecommons.org/licenses/by/4.0 en_ZA
dc.source Nutrition Journal en_ZA
dc.source.uri http://www.nutritionj.com/ en_ZA
dc.subject.other Dietary intake assessment en_ZA
dc.subject.other Food frequency questionnaire en_ZA
dc.subject.other Statistical tests en_ZA
dc.title Application and interpretation of multiple statistical tests to evaluate validity of dietary intake assessment methods en_ZA
dc.type Journal Article en_ZA
dc.rights.holder 2015 Lombard et al. en_ZA
uct.type.publication Research en_ZA
uct.type.resource Article en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Health Sciences en_ZA
dc.publisher.department Division of Human Nutrition en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Lombard, M., Steyn, N., Charlton, K., & Senekal, M. (2015). Application and interpretation of multiple statistical tests to evaluate validity of dietary intake assessment methods. <i>Nutrition Journal</i>, http://hdl.handle.net/11427/14657 en_ZA
dc.identifier.chicagocitation Lombard, Martani, Nelia Steyn, Karen Charlton, and Marjanne Senekal "Application and interpretation of multiple statistical tests to evaluate validity of dietary intake assessment methods." <i>Nutrition Journal</i> (2015) http://hdl.handle.net/11427/14657 en_ZA
dc.identifier.vancouvercitation Lombard M, Steyn N, Charlton K, Senekal M. Application and interpretation of multiple statistical tests to evaluate validity of dietary intake assessment methods. Nutrition Journal. 2015; http://hdl.handle.net/11427/14657. en_ZA
dc.identifier.ris TY - Journal Article AU - Lombard, Martani AU - Steyn, Nelia AU - Charlton, Karen AU - Senekal, Marjanne AB - BACKGROUND:Several statistical tests are currently applied to evaluate validity of dietary intake assessment methods. However, they provide information on different facets of validity. There is also no consensus on types and combinations of tests that should be applied to reflect acceptable validity for intakes. We aimed to 1) conduct a review to identify the tests and interpretation criteria used where dietary assessment methods was validated against a reference method and 2) illustrate the value of and challenges that arise in interpretation of outcomes of multiple statistical tests in assessment of validity using a test data set. METHODS: An in-depth literature review was undertaken to identify the range of statistical tests used in the validation of quantitative food frequency questionnaires (QFFQs). Four databases were accessed to search for statistical methods and interpretation criteria used in papers focusing on relative validity. The identified tests and interpretation criteria were applied to a data set obtained using a QFFQ and four repeated 24-hour recalls from 47 adults (18-65 years) residing in rural Eastern Cape, South Africa. RESULTS: 102 studies were screened and 60 were included. Six statistical tests were identified; five with one set of interpretation criteria and one with two sets of criteria, resulting in seven possible validity interpretation outcomes. Twenty-one different combinations of these tests were identified, with the majority including three or less tests. Coefficient of correlation was the most commonly used (as a single test or in combination with one or more tests). Results of our application and interpretation of multiple statistical tests to assess validity of energy, macronutrients and selected micronutrients estimates illustrate that for most of the nutrients considered, some outcomes support validity, while others do not. CONCLUSIONS: One to three statistical tests may not be sufficient to provide comprehensive insights into various facets of validity. Results of our application and interpretation of multiple statistical tests support the value of such an approach in gaining comprehensive insights in different facets of validity. These insights should be considered in the formulation of conclusions regarding validity to answer a particular dietary intake related research question. DA - 2015 DB - OpenUCT DO - 10.1186/s12937-015-0027-y DP - University of Cape Town J1 - Nutrition Journal LK - https://open.uct.ac.za PB - University of Cape Town PY - 2015 T1 - Application and interpretation of multiple statistical tests to evaluate validity of dietary intake assessment methods TI - Application and interpretation of multiple statistical tests to evaluate validity of dietary intake assessment methods UR - http://hdl.handle.net/11427/14657 ER - en_ZA


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