Development, validation and implementation of a quantitative food frequency questionnaire to assess habitual vitamin D intake.
J Hum Nutr Diet
; 29(4): 495-504, 2016 08.
Article
en En
| MEDLINE
| ID: mdl-26778044
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(-1) 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(-1) . 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.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Vitamina D
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Deficiencia de Vitamina D
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Evaluación Nutricional
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Encuestas Nutricionales
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Cooperación del Paciente
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Suplementos Dietéticos
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Dieta Saludable
Tipo de estudio:
Etiology_studies
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Prevalence_studies
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Prognostic_studies
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Risk_factors_studies
Límite:
Adolescent
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Aged
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Child
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Female
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Humans
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Middle aged
País/Región como asunto:
Europa
Idioma:
En
Revista:
J Hum Nutr Diet
Asunto de la revista:
CIENCIAS DA NUTRICAO
Año:
2016
Tipo del documento:
Article
País de afiliación:
Irlanda
Pais de publicación:
Reino Unido