Jesús Vioque|Eva María Navarrete?Muñoz|Daniel Giménez-Monzó|Manuela García?de?la?Hera|Fernando Granado|Ian S. Young|Rosa Ramón|Ferrán Ballester|Mario Murcia|Marisa Rebagliato|Carmen Íñiguez
Reproducibility and validity of a food frequency questionnaire among pregnant women in a Mediterranean area
Universitat de Miguel Hernández d'Elx|Departamento de Salud|Universitat de Miguel Hernández d'Elx|Departamento de Salud|Universitat de Miguel Hernández d'Elx|Departamento de Salud|Universitat de Miguel Hernández d'Elx|Departamento de Salud|Hospital Universitario Puerta de Hierro Majadahonda|Queen's University Belfast|Centro de Investigación Biomédica en Red de Epidemiología y Salud Pública|Universitat de València|Centro de Investigación Biomédica en Red de Epidemiología y Salud Pública|Centro de Investigación Biomédica en Red de Epidemiología y Salud Pública|Centro de Investigación Biomédica en Red de Epidemiología y Salud Pública
studies exploring role diet pregnancy still scarce part due complexity measuring diet lack valid instruments aim study examine reproducibility validity biochemical biomarkers semiquantitative food frequency questionnaire ffq pregnant womenparticipants 740 pregnant women populationbased birth cohort study valencia inma study compared nutrient food intakes ffqs estimated two periods pregnancy reproducibility compared energyadjusted intake several carotenoids folate vitamin b12 vitamin c tocopherol ffq first trimester concentration blood specimens validitysignificant correlations reproducibility found major food groups nutrients lycopene r006 average correlation coefficients daily intake 051 food groups 061 nutrients validity statistically significant correlations observed vitamin c 018 carotene 032 carotene 022 luteinzeaxantin 029 cryptoxantin026 nonsignificant correlations observed retinol lycopene tocopherol vitamin b12 folate r012 dietary supplement use considered correlations substantially improved folate 053 lesser extent vitamin b12 012 vitamin c 020this study supports ffq good reproducibility nutrient food intake provide valid estimate several important nutrients pregnancy