科研之友
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摘要
Objective: To evaluate the reliability and relative validity of a semi-quantitative FFQ for assessing the habitual intake of multiple nutrients in New Zealand (NZ) adults over the past 12 months. Design: A 154-item FFQ was developed. After initial pre-testing, reliability was assessed using intra-class correlations. Relative validity was assessed by comparing nutrient intakes derived from the FFQ v. those from an 8d diet record (8dWDR) collected over 12 months and selected blood biomarkers, using Spearman correlations. Supplementary cross-classification and Bland-Altman analyses were performed to assess validity of the FFQ v. the 8dWDR. Setting: Dunedin, NZ. Subjects: One hundred and thirty-two males and females aged 30-59 years who completed all FFQ and 8dWDR and provided a blood sample. Results: Reliability coefficients ranged from 0.47 for Ca to 0.83 for alcohol, with most values falling between 0.60 and 0.80. The highest validity coefficients for energy-adjusted data were observed for alcohol (0.74), cholesterol (0.65) and beta-carotene (0.58), and the lowest for Zn (0.24) and Ca (0.28). For all energy-adjusted nutrients mean percentage correct classification was 77.9% and gross misclassification was 4.5%. Results of Bland-Altman analyses showed wide limits of agreement for all micronutrients but high agreement was observed for most macronutrients (99% for protein, 103% for total fat). When compared with biomarkers, energy-adjusted coefficients were 0.34 for beta-carotene and 0.33 for vitamin C. Conclusions: The FFQ provides highly repeatable measurements and good validity in ranking individuals' intake, suggesting that it will be a useful tool to assess nutrient intake of NZ adults in future research.
- 出版日期2014-2
