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Relative validity and reproducibility of a quantitative FFQ for assessing nutrient intakes of vegetarians in Taiwan

Abstract Objective To assess the relative validity and reproducibility of the quantitative FFQ used in the Tzu Chi Health Study (TCHS). Design The reproducibility was evaluated by comparing the baseline FFQ with the 2-year follow-up FFQ. The validity was evaluated by comparing the baseline FFQ with... Full description

Journal Title: Public Health Nutrition 2014, Vol.17(7), pp.1459-1466
Main Author: Chiu, Tina Ht
Other Authors: Huang, Hui-Ya , Chen, Kuan-Ju , Wu, Yu-Ru , Chiu, Jason Pc , Li, Yi-Hwei , Chiu, Brian C-H , Lin, Chin-Lon , Lin, Ming-Nan
Format: Electronic Article Electronic Article
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Ffq
ID: ISSN: 1368-9800 ; E-ISSN: 1475-2727 ; DOI: 10.1017/S1368980013001560
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title: Relative validity and reproducibility of a quantitative FFQ for assessing nutrient intakes of vegetarians in Taiwan
format: Article
creator:
  • Chiu, Tina Ht
  • Huang, Hui-Ya
  • Chen, Kuan-Ju
  • Wu, Yu-Ru
  • Chiu, Jason Pc
  • Li, Yi-Hwei
  • Chiu, Brian C-H
  • Lin, Chin-Lon
  • Lin, Ming-Nan
subjects:
  • Assessment And Methodology
  • Ffq
  • Tzu Chi Health Study
  • Ffq Validation
  • Reliability
  • Biomarker
ispartof: Public Health Nutrition, 2014, Vol.17(7), pp.1459-1466
description: Abstract Objective To assess the relative validity and reproducibility of the quantitative FFQ used in the Tzu Chi Health Study (TCHS). Design The reproducibility was evaluated by comparing the baseline FFQ with the 2-year follow-up FFQ. The validity was evaluated by comparing the baseline FFQ with 3 d dietary records and biomarkers (serum folate and vitamin B 12 ). Median comparison, cross-classification and Spearman correlation with and without energy adjustment and deattenuation for day-to-day variation were assessed. Setting TCHS is a prospective cohort containing a high proportion of true vegetarians and part-time vegetarians (regularly consuming a vegetarian diet without completely avoiding meat). Subject Subsets of 103, seventy-eight and 1528 TCHS participants were included in the reproducibility, dietary record-validity and biomarker-validity studies, respectively. Results Correlations assessing the reproducibility for repeat administrations of the FFQ were in the range of 0·46–0·65 for macronutrients and 0·35–0·67 for micronutrients; the average same quartile agreement was 40%. The correlation between FFQ and biomarkers was 0·41 for both vitamin B 12 and folate. Moderate to good correlations between the baseline FFQ and dietary records were found for energy, protein, carbohydrate, saturated and monounsaturated fat, fibre, vitamin C, vitamin A, K, Ca, Mg, P, Fe and Zn (average crude correlation: 0·47 (range: 0·37–0·66); average energy-adjusted correlation: 0·43 (range: 0·38–0·55); average energy-adjusted deattenuated correlation: 0·50 (range: 0·44–0·66)) with same quartile agreement rate of 39% (range: 35–45%), while misclassification to the extreme quartile was rare (average: 4% (range: 0–6%)). Conclusions The FFQ is a reliable and valid tool to rank relative intake of major nutrients for TCHS participants.
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identifier: ISSN: 1368-9800 ; E-ISSN: 1475-2727 ; DOI: 10.1017/S1368980013001560
fulltext: no_fulltext
issn:
  • 13689800
  • 1368-9800
  • 14752727
  • 1475-2727
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titleRelative validity and reproducibility of a quantitative FFQ for assessing nutrient intakes of vegetarians in Taiwan
creatorChiu, Tina Ht ; Huang, Hui-Ya ; Chen, Kuan-Ju ; Wu, Yu-Ru ; Chiu, Jason Pc ; Li, Yi-Hwei ; Chiu, Brian C-H ; Lin, Chin-Lon ; Lin, Ming-Nan
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subjectAssessment And Methodology; Ffq; Tzu Chi Health Study; Ffq Validation; Reliability; Biomarker
descriptionAbstract Objective To assess the relative validity and reproducibility of the quantitative FFQ used in the Tzu Chi Health Study (TCHS). Design The reproducibility was evaluated by comparing the baseline FFQ with the 2-year follow-up FFQ. The validity was evaluated by comparing the baseline FFQ with 3 d dietary records and biomarkers (serum folate and vitamin B 12 ). Median comparison, cross-classification and Spearman correlation with and without energy adjustment and deattenuation for day-to-day variation were assessed. Setting TCHS is a prospective cohort containing a high proportion of true vegetarians and part-time vegetarians (regularly consuming a vegetarian diet without completely avoiding meat). Subject Subsets of 103, seventy-eight and 1528 TCHS participants were included in the reproducibility, dietary record-validity and biomarker-validity studies, respectively. Results Correlations assessing the reproducibility for repeat administrations of the FFQ were in the range of 0·46–0·65 for macronutrients and 0·35–0·67 for micronutrients; the average same quartile agreement was 40%. The correlation between FFQ and biomarkers was 0·41 for both vitamin B 12 and folate. Moderate to good correlations between the baseline FFQ and dietary records were found for energy, protein, carbohydrate, saturated and monounsaturated fat, fibre, vitamin C, vitamin A, K, Ca, Mg, P, Fe and Zn (average crude correlation: 0·47 (range: 0·37–0·66); average energy-adjusted correlation: 0·43 (range: 0·38–0·55); average energy-adjusted deattenuated correlation: 0·50 (range: 0·44–0·66)) with same quartile agreement rate of 39% (range: 35–45%), while misclassification to the extreme quartile was rare (average: 4% (range: 0–6%)). Conclusions The FFQ is a reliable and valid tool to rank relative intake of major nutrients for TCHS participants.
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titleRelative validity and reproducibility of a quantitative FFQ for assessing nutrient intakes of vegetarians in Taiwan
descriptionAbstract Objective To assess the relative validity and reproducibility of the quantitative FFQ used in the Tzu Chi Health Study (TCHS). Design The reproducibility was evaluated by comparing the baseline FFQ with the 2-year follow-up FFQ. The validity was evaluated by comparing the baseline FFQ with 3 d dietary records and biomarkers (serum folate and vitamin B 12 ). Median comparison, cross-classification and Spearman correlation with and without energy adjustment and deattenuation for day-to-day variation were assessed. Setting TCHS is a prospective cohort containing a high proportion of true vegetarians and part-time vegetarians (regularly consuming a vegetarian diet without completely avoiding meat). Subject Subsets of 103, seventy-eight and 1528 TCHS participants were included in the reproducibility, dietary record-validity and biomarker-validity studies, respectively. Results Correlations assessing the reproducibility for repeat administrations of the FFQ were in the range of 0·46–0·65 for macronutrients and 0·35–0·67 for micronutrients; the average same quartile agreement was 40%. The correlation between FFQ and biomarkers was 0·41 for both vitamin B 12 and folate. Moderate to good correlations between the baseline FFQ and dietary records were found for energy, protein, carbohydrate, saturated and monounsaturated fat, fibre, vitamin C, vitamin A, K, Ca, Mg, P, Fe and Zn (average crude correlation: 0·47 (range: 0·37–0·66); average energy-adjusted correlation: 0·43 (range: 0·38–0·55); average energy-adjusted deattenuated correlation: 0·50 (range: 0·44–0·66)) with same quartile agreement rate of 39% (range: 35–45%), while misclassification to the extreme quartile was rare (average: 4% (range: 0–6%)). Conclusions The FFQ is a reliable and valid tool to rank relative intake of major nutrients for TCHS participants.
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titleRelative validity and reproducibility of a quantitative FFQ for assessing nutrient intakes of vegetarians in Taiwan
authorChiu, Tina Ht ; Huang, Hui-Ya ; Chen, Kuan-Ju ; Wu, Yu-Ru ; Chiu, Jason Pc ; Li, Yi-Hwei ; Chiu, Brian C-H ; Lin, Chin-Lon ; Lin, Ming-Nan
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abstractAbstract Objective To assess the relative validity and reproducibility of the quantitative FFQ used in the Tzu Chi Health Study (TCHS). Design The reproducibility was evaluated by comparing the baseline FFQ with the 2-year follow-up FFQ. The validity was evaluated by comparing the baseline FFQ with 3 d dietary records and biomarkers (serum folate and vitamin B 12 ). Median comparison, cross-classification and Spearman correlation with and without energy adjustment and deattenuation for day-to-day variation were assessed. Setting TCHS is a prospective cohort containing a high proportion of true vegetarians and part-time vegetarians (regularly consuming a vegetarian diet without completely avoiding meat). Subject Subsets of 103, seventy-eight and 1528 TCHS participants were included in the reproducibility, dietary record-validity and biomarker-validity studies, respectively. Results Correlations assessing the reproducibility for repeat administrations of the FFQ were in the range of 0·46–0·65 for macronutrients and 0·35–0·67 for micronutrients; the average same quartile agreement was 40%. The correlation between FFQ and biomarkers was 0·41 for both vitamin B 12 and folate. Moderate to good correlations between the baseline FFQ and dietary records were found for energy, protein, carbohydrate, saturated and monounsaturated fat, fibre, vitamin C, vitamin A, K, Ca, Mg, P, Fe and Zn (average crude correlation: 0·47 (range: 0·37–0·66); average energy-adjusted correlation: 0·43 (range: 0·38–0·55); average energy-adjusted deattenuated correlation: 0·50 (range: 0·44–0·66)) with same quartile agreement rate of 39% (range: 35–45%), while misclassification to the extreme quartile was rare (average: 4% (range: 0–6%)). Conclusions The FFQ is a reliable and valid tool to rank relative intake of major nutrients for TCHS participants.
pubCambridge University Press
doi10.1017/S1368980013001560
pages1459-66
date2014-07