Validity assessment of a food frequency questionnaire by comparison with a 4-day diet record.
Autor(a) principal: | |
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Data de Publicação: | 2003 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | https://www.actamedicaportuguesa.com/revista/index.php/amp/article/view/1218 |
Resumo: | When dietary methods are used to evaluate nutritional intake, it is important to know which methods are most appropriate to ensure validity in nutrient intake studies. Our main objective was to assess the validity of a semi-quantitative food-frequency questionnaire (FFQ) developed for Portuguese adults by comparing nutrient intake (energy and 44 nutrients) assessed by FFQ with the nutritional data from a four-day diet record (DR). The FFQ was developed by the Epidemiology Department, Faculty of Medicine, University of Porto, and allowed the subjects to indicate their daily, weekly or monthly intake of 89 foods. Subjects were 246 university students (159 females and 87 males, aged 18 to 29 years). Mean intakes from the FFQ were generally higher than those from the DR. Pearson correlation coefficients between FFQ and DR ranged from 0.21 for vitamin D, to 0.73, for iodine. When energy-adjusted, this coefficients ranged from 0.20, for selenium, to 0.75 for iodine. Misclassification in opposite extreme quintiles varied from 0% to 16%, and the proportion of subjects correctly classified within the lowest two quintiles ranged between 52% and 84%. The distribution of those correctly classified within the highest two quintiles ranged between 51% and 88%. Exact classification in the same quintile of ingestion varied from 26% and 41%. These data suggest that this FFQ provides valid estimates of intakes for major nutrients, comparable to those reported from other studies in the literature. |
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Validity assessment of a food frequency questionnaire by comparison with a 4-day diet record.Validade relativa de um questionário de frequência de consumo alimentar através da comparação com um registro alimentar de quatro dias.When dietary methods are used to evaluate nutritional intake, it is important to know which methods are most appropriate to ensure validity in nutrient intake studies. Our main objective was to assess the validity of a semi-quantitative food-frequency questionnaire (FFQ) developed for Portuguese adults by comparing nutrient intake (energy and 44 nutrients) assessed by FFQ with the nutritional data from a four-day diet record (DR). The FFQ was developed by the Epidemiology Department, Faculty of Medicine, University of Porto, and allowed the subjects to indicate their daily, weekly or monthly intake of 89 foods. Subjects were 246 university students (159 females and 87 males, aged 18 to 29 years). Mean intakes from the FFQ were generally higher than those from the DR. Pearson correlation coefficients between FFQ and DR ranged from 0.21 for vitamin D, to 0.73, for iodine. When energy-adjusted, this coefficients ranged from 0.20, for selenium, to 0.75 for iodine. Misclassification in opposite extreme quintiles varied from 0% to 16%, and the proportion of subjects correctly classified within the lowest two quintiles ranged between 52% and 84%. The distribution of those correctly classified within the highest two quintiles ranged between 51% and 88%. Exact classification in the same quintile of ingestion varied from 26% and 41%. These data suggest that this FFQ provides valid estimates of intakes for major nutrients, comparable to those reported from other studies in the literature.When dietary methods are used to evaluate nutritional intake, it is important to know which methods are most appropriate to ensure validity in nutrient intake studies. Our main objective was to assess the validity of a semi-quantitative food-frequency questionnaire (FFQ) developed for Portuguese adults by comparing nutrient intake (energy and 44 nutrients) assessed by FFQ with the nutritional data from a four-day diet record (DR). The FFQ was developed by the Epidemiology Department, Faculty of Medicine, University of Porto, and allowed the subjects to indicate their daily, weekly or monthly intake of 89 foods. Subjects were 246 university students (159 females and 87 males, aged 18 to 29 years). Mean intakes from the FFQ were generally higher than those from the DR. Pearson correlation coefficients between FFQ and DR ranged from 0.21 for vitamin D, to 0.73, for iodine. When energy-adjusted, this coefficients ranged from 0.20, for selenium, to 0.75 for iodine. Misclassification in opposite extreme quintiles varied from 0% to 16%, and the proportion of subjects correctly classified within the lowest two quintiles ranged between 52% and 84%. The distribution of those correctly classified within the highest two quintiles ranged between 51% and 88%. Exact classification in the same quintile of ingestion varied from 26% and 41%. These data suggest that this FFQ provides valid estimates of intakes for major nutrients, comparable to those reported from other studies in the literature.Ordem dos Médicos2003-12-31info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttps://www.actamedicaportuguesa.com/revista/index.php/amp/article/view/1218oai:ojs.www.actamedicaportuguesa.com:article/1218Acta Médica Portuguesa; Vol. 16 No. 6 (2003): November-December; 412-20Acta Médica Portuguesa; Vol. 16 N.º 6 (2003): Novembro-Dezembro; 412-201646-07580870-399Xreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAPporhttps://www.actamedicaportuguesa.com/revista/index.php/amp/article/view/1218https://www.actamedicaportuguesa.com/revista/index.php/amp/article/view/1218/870Moreira, PedroSampaio, DanielAlmeida, Maria Daniel Vaz deinfo:eu-repo/semantics/openAccess2022-12-20T10:57:39Zoai:ojs.www.actamedicaportuguesa.com:article/1218Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:17:02.594271Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Validity assessment of a food frequency questionnaire by comparison with a 4-day diet record. Validade relativa de um questionário de frequência de consumo alimentar através da comparação com um registro alimentar de quatro dias. |
title |
Validity assessment of a food frequency questionnaire by comparison with a 4-day diet record. |
spellingShingle |
Validity assessment of a food frequency questionnaire by comparison with a 4-day diet record. Moreira, Pedro |
title_short |
Validity assessment of a food frequency questionnaire by comparison with a 4-day diet record. |
title_full |
Validity assessment of a food frequency questionnaire by comparison with a 4-day diet record. |
title_fullStr |
Validity assessment of a food frequency questionnaire by comparison with a 4-day diet record. |
title_full_unstemmed |
Validity assessment of a food frequency questionnaire by comparison with a 4-day diet record. |
title_sort |
Validity assessment of a food frequency questionnaire by comparison with a 4-day diet record. |
author |
Moreira, Pedro |
author_facet |
Moreira, Pedro Sampaio, Daniel Almeida, Maria Daniel Vaz de |
author_role |
author |
author2 |
Sampaio, Daniel Almeida, Maria Daniel Vaz de |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Moreira, Pedro Sampaio, Daniel Almeida, Maria Daniel Vaz de |
description |
When dietary methods are used to evaluate nutritional intake, it is important to know which methods are most appropriate to ensure validity in nutrient intake studies. Our main objective was to assess the validity of a semi-quantitative food-frequency questionnaire (FFQ) developed for Portuguese adults by comparing nutrient intake (energy and 44 nutrients) assessed by FFQ with the nutritional data from a four-day diet record (DR). The FFQ was developed by the Epidemiology Department, Faculty of Medicine, University of Porto, and allowed the subjects to indicate their daily, weekly or monthly intake of 89 foods. Subjects were 246 university students (159 females and 87 males, aged 18 to 29 years). Mean intakes from the FFQ were generally higher than those from the DR. Pearson correlation coefficients between FFQ and DR ranged from 0.21 for vitamin D, to 0.73, for iodine. When energy-adjusted, this coefficients ranged from 0.20, for selenium, to 0.75 for iodine. Misclassification in opposite extreme quintiles varied from 0% to 16%, and the proportion of subjects correctly classified within the lowest two quintiles ranged between 52% and 84%. The distribution of those correctly classified within the highest two quintiles ranged between 51% and 88%. Exact classification in the same quintile of ingestion varied from 26% and 41%. These data suggest that this FFQ provides valid estimates of intakes for major nutrients, comparable to those reported from other studies in the literature. |
publishDate |
2003 |
dc.date.none.fl_str_mv |
2003-12-31 |
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info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
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article |
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publishedVersion |
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https://www.actamedicaportuguesa.com/revista/index.php/amp/article/view/1218 oai:ojs.www.actamedicaportuguesa.com:article/1218 |
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https://www.actamedicaportuguesa.com/revista/index.php/amp/article/view/1218 |
identifier_str_mv |
oai:ojs.www.actamedicaportuguesa.com:article/1218 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://www.actamedicaportuguesa.com/revista/index.php/amp/article/view/1218 https://www.actamedicaportuguesa.com/revista/index.php/amp/article/view/1218/870 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
dc.publisher.none.fl_str_mv |
Ordem dos Médicos |
publisher.none.fl_str_mv |
Ordem dos Médicos |
dc.source.none.fl_str_mv |
Acta Médica Portuguesa; Vol. 16 No. 6 (2003): November-December; 412-20 Acta Médica Portuguesa; Vol. 16 N.º 6 (2003): Novembro-Dezembro; 412-20 1646-0758 0870-399X reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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