Relative validity of an FFQ to estimate daily food and nutrient intakes for Chilean adults

Mahshid Dehghan, Solange Martinez, Xiaohe Zhang, Pamela Seron, Fernando Lanas, Shofiqul Islam, Anwar T Merchant, Mahshid Dehghan, Solange Martinez, Xiaohe Zhang, Pamela Seron, Fernando Lanas, Shofiqul Islam, Anwar T Merchant

Abstract

Objective: FFQ are commonly used to rank individuals by their food and nutrient intakes in large epidemiological studies. The purpose of the present study was to develop and validate an FFQ to rank individuals participating in an ongoing Prospective Urban and Rural Epidemiological (PURE) study in Chile.

Design: An FFQ and four 24 h dietary recalls were completed over 1 year. Pearson correlation coefficients, energy-adjusted and de-attenuated correlations and weighted kappa were computed between the dietary recalls and the FFQ. The level of agreement between the two dietary assessment methods was evaluated by Bland-Altman analysis.

Setting: Temuco, Chile.

Subjects: Overall, 166 women and men enrolled in the present study. One hundred men and women participated in FFQ development and sixty-six individuals participated in FFQ validation.

Results: The FFQ consisted of 109 food items. For nutrients, the crude correlation coefficients between the dietary recalls and FFQ varied from 0.14 (protein) to 0.44 (fat). Energy adjustment and de-attenuation improved correlation coefficients and almost all correlation coefficients exceeded 0.40. Similar correlation coefficients were observed for food groups; the highest de-attenuated energy adjusted correlation coefficient was found for margarine and butter (0.75) and the lowest for potatoes (0.12).

Conclusions: The FFQ showed moderate to high agreement for most nutrients and food groups, and can be used to rank individuals based on energy, nutrient and food intakes. The validation study was conducted in a unique setting and indicated that the tool is valid for use by adults in Chile.

Figures

Fig. 1
Fig. 1
Bland–Altman plots assessing the level of agreement between the FFQ and four 24 h dietary recalls among men and women (n 66) participating in the FFQ validation study. The difference between mean intakes estimated by the FFQ and dietary recalls (DR) was plotted against the average of mean intakes by the two methods for each participant and for: (a) energy; (b) protein; (c) carbohydrate; (d) total fat; (e) SFA; (f) PUFA; (g) fibre; (h) folate; (i) vitamin C; (j) sodium; (k) potassium; (l) calcium. ———, Mean difference; – – – –, 95 % limits of agreements

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