Relative validity of a semi-quantitative, web-based FFQ used in the ‘Snart Forældre’ cohort – a Danish study of diet and fertility

Vibeke Kildegaard Knudsen, Elizabeth E. Hatch, Heidi Cueto, Katherine L. Tucker, Lauren Wise, Tue Christensen, Ellen M. Mikkelsen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Objective: To assess the relative validity of a semi-quantitative, web-based FFQ completed by female pregnancy planners in the Danish ‘Snart Forældre’ study. Design: We validated a web-based FFQ based on the FFQ used in the Danish National Birth Cohort against a 4 d food diary (FD) and assessed the relative validity of intakes of foods and nutrients. We compared means and medians of intakes, and calculated Pearson correlation coefficients and de-attenuated coefficients to assess agreement between the two methods. We also calculated the proportion correctly classified based on the same or adjacent quintile of intake and the proportion of grossly misclassified (extreme quintiles). Setting: Participants (n 128) in the ‘Snart Forældre’ study who had completed the web-based FFQ were invited to participate in the validation study. Subjects: Participants in the ‘Snart Forældre’ study, in total ninety-seven women aged 20–42 years. Results: Reported intakes of dairy products, vegetables and potatoes were higher in the FFQ compared with the FD, whereas reported intakes of fruit, meat, sugar and beverages were lower in the FFQ than in the FD. Overall the de-attenuated correlation coefficients were acceptable, ranging from 0·33 for energy to 0·93 for vitamin D. The majority of the women were classified in the same or adjacent quintile and few women were misclassified (extreme quintiles). Conclusion: The web-based FFQ performs well for ranking women of reproductive age according to high or low intake of foods and nutrients and, thus, provides a solid basis for investigating associations between diet and fertility.
Original languageEnglish
JournalPublic Health Nutrition
Volume19
Issue number6
Pages (from-to)1027-1034
ISSN1368-9800
DOIs
Publication statusPublished - 2015

Keywords

  • Medicine (miscellaneous)
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Fecundity
  • Pre-pregnancy
  • Relative validity
  • Web-based FFQ

Cite this

Knudsen, Vibeke Kildegaard ; Hatch, Elizabeth E. ; Cueto, Heidi ; Tucker, Katherine L. ; Wise, Lauren ; Christensen, Tue ; Mikkelsen, Ellen M. / Relative validity of a semi-quantitative, web-based FFQ used in the ‘Snart Forældre’ cohort – a Danish study of diet and fertility. In: Public Health Nutrition. 2015 ; Vol. 19, No. 6. pp. 1027-1034.
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title = "Relative validity of a semi-quantitative, web-based FFQ used in the ‘Snart For{\ae}ldre’ cohort – a Danish study of diet and fertility",
abstract = "Objective: To assess the relative validity of a semi-quantitative, web-based FFQ completed by female pregnancy planners in the Danish ‘Snart For{\ae}ldre’ study. Design: We validated a web-based FFQ based on the FFQ used in the Danish National Birth Cohort against a 4 d food diary (FD) and assessed the relative validity of intakes of foods and nutrients. We compared means and medians of intakes, and calculated Pearson correlation coefficients and de-attenuated coefficients to assess agreement between the two methods. We also calculated the proportion correctly classified based on the same or adjacent quintile of intake and the proportion of grossly misclassified (extreme quintiles). Setting: Participants (n 128) in the ‘Snart For{\ae}ldre’ study who had completed the web-based FFQ were invited to participate in the validation study. Subjects: Participants in the ‘Snart For{\ae}ldre’ study, in total ninety-seven women aged 20–42 years. Results: Reported intakes of dairy products, vegetables and potatoes were higher in the FFQ compared with the FD, whereas reported intakes of fruit, meat, sugar and beverages were lower in the FFQ than in the FD. Overall the de-attenuated correlation coefficients were acceptable, ranging from 0·33 for energy to 0·93 for vitamin D. The majority of the women were classified in the same or adjacent quintile and few women were misclassified (extreme quintiles). Conclusion: The web-based FFQ performs well for ranking women of reproductive age according to high or low intake of foods and nutrients and, thus, provides a solid basis for investigating associations between diet and fertility.",
keywords = "Medicine (miscellaneous), Nutrition and Dietetics, Public Health, Environmental and Occupational Health, Fecundity, Pre-pregnancy, Relative validity, Web-based FFQ",
author = "Knudsen, {Vibeke Kildegaard} and Hatch, {Elizabeth E.} and Heidi Cueto and Tucker, {Katherine L.} and Lauren Wise and Tue Christensen and Mikkelsen, {Ellen M.}",
year = "2015",
doi = "10.1017/s1368980015002189",
language = "English",
volume = "19",
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Relative validity of a semi-quantitative, web-based FFQ used in the ‘Snart Forældre’ cohort – a Danish study of diet and fertility. / Knudsen, Vibeke Kildegaard; Hatch, Elizabeth E.; Cueto, Heidi; Tucker, Katherine L.; Wise, Lauren; Christensen, Tue; Mikkelsen, Ellen M.

In: Public Health Nutrition, Vol. 19, No. 6, 2015, p. 1027-1034.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Relative validity of a semi-quantitative, web-based FFQ used in the ‘Snart Forældre’ cohort – a Danish study of diet and fertility

AU - Knudsen, Vibeke Kildegaard

AU - Hatch, Elizabeth E.

AU - Cueto, Heidi

AU - Tucker, Katherine L.

AU - Wise, Lauren

AU - Christensen, Tue

AU - Mikkelsen, Ellen M.

PY - 2015

Y1 - 2015

N2 - Objective: To assess the relative validity of a semi-quantitative, web-based FFQ completed by female pregnancy planners in the Danish ‘Snart Forældre’ study. Design: We validated a web-based FFQ based on the FFQ used in the Danish National Birth Cohort against a 4 d food diary (FD) and assessed the relative validity of intakes of foods and nutrients. We compared means and medians of intakes, and calculated Pearson correlation coefficients and de-attenuated coefficients to assess agreement between the two methods. We also calculated the proportion correctly classified based on the same or adjacent quintile of intake and the proportion of grossly misclassified (extreme quintiles). Setting: Participants (n 128) in the ‘Snart Forældre’ study who had completed the web-based FFQ were invited to participate in the validation study. Subjects: Participants in the ‘Snart Forældre’ study, in total ninety-seven women aged 20–42 years. Results: Reported intakes of dairy products, vegetables and potatoes were higher in the FFQ compared with the FD, whereas reported intakes of fruit, meat, sugar and beverages were lower in the FFQ than in the FD. Overall the de-attenuated correlation coefficients were acceptable, ranging from 0·33 for energy to 0·93 for vitamin D. The majority of the women were classified in the same or adjacent quintile and few women were misclassified (extreme quintiles). Conclusion: The web-based FFQ performs well for ranking women of reproductive age according to high or low intake of foods and nutrients and, thus, provides a solid basis for investigating associations between diet and fertility.

AB - Objective: To assess the relative validity of a semi-quantitative, web-based FFQ completed by female pregnancy planners in the Danish ‘Snart Forældre’ study. Design: We validated a web-based FFQ based on the FFQ used in the Danish National Birth Cohort against a 4 d food diary (FD) and assessed the relative validity of intakes of foods and nutrients. We compared means and medians of intakes, and calculated Pearson correlation coefficients and de-attenuated coefficients to assess agreement between the two methods. We also calculated the proportion correctly classified based on the same or adjacent quintile of intake and the proportion of grossly misclassified (extreme quintiles). Setting: Participants (n 128) in the ‘Snart Forældre’ study who had completed the web-based FFQ were invited to participate in the validation study. Subjects: Participants in the ‘Snart Forældre’ study, in total ninety-seven women aged 20–42 years. Results: Reported intakes of dairy products, vegetables and potatoes were higher in the FFQ compared with the FD, whereas reported intakes of fruit, meat, sugar and beverages were lower in the FFQ than in the FD. Overall the de-attenuated correlation coefficients were acceptable, ranging from 0·33 for energy to 0·93 for vitamin D. The majority of the women were classified in the same or adjacent quintile and few women were misclassified (extreme quintiles). Conclusion: The web-based FFQ performs well for ranking women of reproductive age according to high or low intake of foods and nutrients and, thus, provides a solid basis for investigating associations between diet and fertility.

KW - Medicine (miscellaneous)

KW - Nutrition and Dietetics

KW - Public Health, Environmental and Occupational Health

KW - Fecundity

KW - Pre-pregnancy

KW - Relative validity

KW - Web-based FFQ

U2 - 10.1017/s1368980015002189

DO - 10.1017/s1368980015002189

M3 - Journal article

VL - 19

SP - 1027

EP - 1034

JO - Public Health Nutrition

JF - Public Health Nutrition

SN - 1368-9800

IS - 6

ER -