Biochemical Validation of the Older Australian’s Food Frequency Questionnaire Using Carotenoids and Vitamin E
AbstractBackground: Validation of a food frequency questionnaire (FFQ) is important, as inaccurate and imprecise information may affect the association between dietary exposure and health outcomes. Objective: This study assessed the validity of the Older Australian’s FFQ against plasma carotenoids and Vitamin E. Methods: A random subsample (n = 150) of 2420 participants in the Hunter Community Study, aged 55–85 years, were included. Correlations between crude and energy-adjusted FFQ estimates of carotenoids, Vitamin E, and fruit and vegetables with corresponding biomarkers were determined. Percentages of participants correctly classified in the same quartile, and in the same ± 1 quartile, by the two methods were calculated. Results: Significant correlations (P < 0.05) were observed for α-carotene (r = 0.26–0.28), β-carotene (r = 0.21–0.25), and β-cryptoxanthin (r = 0.21–0.23). Intakes of fruits and vegetables also showed similar correlations with these plasma carotenoids. Lycopene was only significantly correlated with fruit and vegetable intakes (r = 0.19–0.23). Weak correlations were observed for lutein + zeaxanthin (r = 0.12–0.16). For Vitamin E, significant correlation was observed for energy-adjusted FFQ estimate and biomarker (r = 0.20). More than 68% of individuals were correctly classified within the same or adjacent quartile, except for lutein + zeaxanthin. Conclusion: With the exception of lutein + zeaxanthin, the Older Australian’s FFQ provides reasonable rankings for individuals according to their carotenoids, Vitamin E, fruit and vegetable intakes. View Full-Text
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Lai, J.S.; Attia, J.; McEvoy, M.; Hure, A.J. Biochemical Validation of the Older Australian’s Food Frequency Questionnaire Using Carotenoids and Vitamin E. Nutrients 2014, 6, 4906-4917.
Lai JS, Attia J, McEvoy M, Hure AJ. Biochemical Validation of the Older Australian’s Food Frequency Questionnaire Using Carotenoids and Vitamin E. Nutrients. 2014; 6(11):4906-4917.Chicago/Turabian Style
Lai, Jun S.; Attia, John; McEvoy, Mark; Hure, Alexis J. 2014. "Biochemical Validation of the Older Australian’s Food Frequency Questionnaire Using Carotenoids and Vitamin E." Nutrients 6, no. 11: 4906-4917.