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Development, validation and implementation of a quantitative food frequency questionnaire to assess habitual vitamin D intake.
- Source :
- Journal of Human Nutrition & Dietetics; Aug2016, Vol. 29 Issue 4, p495-504, 10p, 1 Diagram, 1 Chart, 1 Graph
- Publication Year :
- 2016
-
Abstract
- Background A well-designed, validated quantitative food frequency questionnaire ( FFQ) could offer an efficient and cost-effective method for assessing habitual vitamin D intake. The present study aimed to describe the development, validation and implementation of a vitamin D FFQ. Methods National food consumption survey data obtained from Irish adults (18-64 years) were used to identify foods that contribute 95% of vitamin D intake. A winter-based validation study was carried out for the resulting FFQ in 120 females, including 98 women [mean (SD) 65.0 (7.3) years] and 22 girls [12.2 (0.8) years], using a 14-day diet history ( DH) as a comparator. Serum 25( OH)D concentrations were analysed. Validity coefficients were calculated using the method of triads. Cross-classification and Bland-Altman analysis were also performed. Results Median (interquartile range) vitamin D intakes (including the contribution from nutritional supplements) were 5.4 (3.7) and 3.7 (5.9) μg day<superscript>−1</superscript> from the FFQ and DH, respectively and intakes of vitamin D from food sources were 3.6 (3.1) and 2.4 (2.2) μg day<superscript>−1</superscript>. The FFQ and DH classified 86% and 87% of individuals into the same and adjacent thirds of wintertime serum 25( OH)D status, respectively. There was a strong association ( r = 0.71, P < 0.0001) and no significant systematic or proportional bias observed for the difference between estimates from the FFQ and DH. The validity coefficient for the FFQ was 0.92 (95% confidence interval = 0.80-0.97). Repeatability analysis ( n = 56) performed 6-12 months later showed no significant difference in estimates of vitamin D between administrations. Conclusions The data obtained in the present study indicate high validity and good reproducibility of a short, interviewer-administered FFQ for vitamin D. [ABSTRACT FROM AUTHOR]
- Subjects :
- ANTHROPOMETRY
CONFIDENCE intervals
STATISTICAL correlation
DIETARY supplements
DOSE-response relationship in biochemistry
EXPERIMENTAL design
INTERVIEWING
LONGITUDINAL method
RESEARCH methodology
NUTRITIONAL assessment
SCIENTIFIC observation
PROBABILITY theory
QUESTIONNAIRES
REGRESSION analysis
RESEARCH evaluation
RESEARCH funding
SEASONS
STATISTICS
T-test (Statistics)
VITAMIN D
DATA analysis
MULTIPLE regression analysis
EFFECT sizes (Statistics)
RESEARCH methodology evaluation
DATA analysis software
DESCRIPTIVE statistics
Subjects
Details
- Language :
- English
- ISSN :
- 09523871
- Volume :
- 29
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Journal of Human Nutrition & Dietetics
- Publication Type :
- Academic Journal
- Accession number :
- 116619162
- Full Text :
- https://doi.org/10.1111/jhn.12348