Reproducibility of a web-based FFQ for 13- to 15-year-old Danish adolescents

Anne A. Bjerregaard, Inge Tetens, Sjurdur F. Olsen, Thorhallur I. Halldorsson

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Abstract

FFQ are widely used in large-scale studies to assess dietary intake. To aid interpretation of diet-disease associations assessment of validity must be performed. Reproducibility is one aspect of validity focusing on the stability of repeated assessment with the same method which may also reveal problems in instrument design or participant instructions. The aim of the present study was to evaluate the reproducibility of a web-based FFQ targeting Danish adolescents within the Danish National Birth Cohort (DNBC). Data for the present study were obtained from a prospective design nested within the DNBC. Adolescents aged 13 to 15 years old (n 48, 60 % girls) completed the FFQ twice 4 weeks apart. The proportion of adolescents consistently classified into the same tertile according to amount of food intake ranged from 45 % (fish) to 77 % (vegetables), whereas classification into opposite tertiles ranged from 0 % (fruit, oils and dressing) to 15 % (beverages). Overall, no significant differences were observed in intake of food groups or nutrients between the two completions of the FFQ. Mean crude Spearman correlation for all food groups was 0·56 and mean intra-class correlation for all food groups was 0·61. In conclusion, the reproducibility of the FFQ for Danish adolescents was acceptable. The study revealed that adolescents aged 13-15 years seemed capable of recalling consistently overall dietary habits and had some difficulties estimating the frequency of consumption of regularly consumed food items.
Original languageEnglish
Article numbere5
JournalJournal of Nutritional Science
Volume5
Number of pages7
ISSN2048-6790
DOIs
Publication statusPublished - 2016

Keywords

  • Adolescents
  • Dietary assessment
  • FFQ
  • GDM, gestational diabetes mellitus
  • ICC, intra-class correlation coefficient
  • Reproducibility
  • Web-based FFQ

Cite this

Bjerregaard, Anne A. ; Tetens, Inge ; Olsen, Sjurdur F. ; Halldorsson, Thorhallur I. / Reproducibility of a web-based FFQ for 13- to 15-year-old Danish adolescents. In: Journal of Nutritional Science. 2016 ; Vol. 5.
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abstract = "FFQ are widely used in large-scale studies to assess dietary intake. To aid interpretation of diet-disease associations assessment of validity must be performed. Reproducibility is one aspect of validity focusing on the stability of repeated assessment with the same method which may also reveal problems in instrument design or participant instructions. The aim of the present study was to evaluate the reproducibility of a web-based FFQ targeting Danish adolescents within the Danish National Birth Cohort (DNBC). Data for the present study were obtained from a prospective design nested within the DNBC. Adolescents aged 13 to 15 years old (n 48, 60 {\%} girls) completed the FFQ twice 4 weeks apart. The proportion of adolescents consistently classified into the same tertile according to amount of food intake ranged from 45 {\%} (fish) to 77 {\%} (vegetables), whereas classification into opposite tertiles ranged from 0 {\%} (fruit, oils and dressing) to 15 {\%} (beverages). Overall, no significant differences were observed in intake of food groups or nutrients between the two completions of the FFQ. Mean crude Spearman correlation for all food groups was 0·56 and mean intra-class correlation for all food groups was 0·61. In conclusion, the reproducibility of the FFQ for Danish adolescents was acceptable. The study revealed that adolescents aged 13-15 years seemed capable of recalling consistently overall dietary habits and had some difficulties estimating the frequency of consumption of regularly consumed food items.",
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author = "Bjerregaard, {Anne A.} and Inge Tetens and Olsen, {Sjurdur F.} and Halldorsson, {Thorhallur I.}",
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Reproducibility of a web-based FFQ for 13- to 15-year-old Danish adolescents. / Bjerregaard, Anne A.; Tetens, Inge; Olsen, Sjurdur F.; Halldorsson, Thorhallur I.

In: Journal of Nutritional Science, Vol. 5, e5, 2016.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Reproducibility of a web-based FFQ for 13- to 15-year-old Danish adolescents

AU - Bjerregaard, Anne A.

AU - Tetens, Inge

AU - Olsen, Sjurdur F.

AU - Halldorsson, Thorhallur I.

PY - 2016

Y1 - 2016

N2 - FFQ are widely used in large-scale studies to assess dietary intake. To aid interpretation of diet-disease associations assessment of validity must be performed. Reproducibility is one aspect of validity focusing on the stability of repeated assessment with the same method which may also reveal problems in instrument design or participant instructions. The aim of the present study was to evaluate the reproducibility of a web-based FFQ targeting Danish adolescents within the Danish National Birth Cohort (DNBC). Data for the present study were obtained from a prospective design nested within the DNBC. Adolescents aged 13 to 15 years old (n 48, 60 % girls) completed the FFQ twice 4 weeks apart. The proportion of adolescents consistently classified into the same tertile according to amount of food intake ranged from 45 % (fish) to 77 % (vegetables), whereas classification into opposite tertiles ranged from 0 % (fruit, oils and dressing) to 15 % (beverages). Overall, no significant differences were observed in intake of food groups or nutrients between the two completions of the FFQ. Mean crude Spearman correlation for all food groups was 0·56 and mean intra-class correlation for all food groups was 0·61. In conclusion, the reproducibility of the FFQ for Danish adolescents was acceptable. The study revealed that adolescents aged 13-15 years seemed capable of recalling consistently overall dietary habits and had some difficulties estimating the frequency of consumption of regularly consumed food items.

AB - FFQ are widely used in large-scale studies to assess dietary intake. To aid interpretation of diet-disease associations assessment of validity must be performed. Reproducibility is one aspect of validity focusing on the stability of repeated assessment with the same method which may also reveal problems in instrument design or participant instructions. The aim of the present study was to evaluate the reproducibility of a web-based FFQ targeting Danish adolescents within the Danish National Birth Cohort (DNBC). Data for the present study were obtained from a prospective design nested within the DNBC. Adolescents aged 13 to 15 years old (n 48, 60 % girls) completed the FFQ twice 4 weeks apart. The proportion of adolescents consistently classified into the same tertile according to amount of food intake ranged from 45 % (fish) to 77 % (vegetables), whereas classification into opposite tertiles ranged from 0 % (fruit, oils and dressing) to 15 % (beverages). Overall, no significant differences were observed in intake of food groups or nutrients between the two completions of the FFQ. Mean crude Spearman correlation for all food groups was 0·56 and mean intra-class correlation for all food groups was 0·61. In conclusion, the reproducibility of the FFQ for Danish adolescents was acceptable. The study revealed that adolescents aged 13-15 years seemed capable of recalling consistently overall dietary habits and had some difficulties estimating the frequency of consumption of regularly consumed food items.

KW - Adolescents

KW - Dietary assessment

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KW - GDM, gestational diabetes mellitus

KW - ICC, intra-class correlation coefficient

KW - Reproducibility

KW - Web-based FFQ

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JO - Journal of Nutritional Science

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