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Issues In Assessing The Validity Of Nutrient Data Obtained From A Food-Frequency Questionnaire: Folate And Vitamin B12 Examples, Victoria Flood, Wayne T. Smith, Karen L. Webb, Paul Mitchell
Issues In Assessing The Validity Of Nutrient Data Obtained From A Food-Frequency Questionnaire: Folate And Vitamin B12 Examples, Victoria Flood, Wayne T. Smith, Karen L. Webb, Paul Mitchell
Faculty of Social Sciences - Papers (Archive)
Objective: To compare methods used to assess the validity of nutrient intake data obtained from a food-frequency questionnaire (FFQ), using folate and vitamin B12 as nutrient examples.
Design: Cross-sectional sample from a population cohort.
Setting: Two postcode areas west of Sydney, Australia.
Subjects: In total, 2895 people aged 49 years and older provided dietary data using a semi-quantitative FFQ (79% of 3654 subjects examined). The validity of the FFQ was assessed against three 4-day weighed food records (WFRs) completed by 78 people (mean age 70 years).
Results: Folate and vitamin B12 validity data were assessed using different methods. …