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Nutrients 2015, 7(2), 785-798; doi:10.3390/nu7020785

The Comparative Validity and Reproducibility of a Diet Quality Index for Adults: The Australian Recommended Food Score

1
Nutrition and Dietetics, School of Health Sciences, Faculty of Health and Medicine, University of Newcastle, Newcastle 2300, Australia
2
Priority Research Centre in Physical Activity and Nutrition, University of Newcastle, Newcastle 2300, Australia
3
Occupational Health and Safety, School of Health Sciences, Faculty of Health and Medicine, University of Newcastle, Newcastle 2300, Australia
4
School of Mathematical and Statistical Sciences, College of Liberal Arts and Science, Arizona State University, Tempe, AZ 85287, USA
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 11 November 2014 / Revised: 1 December 2014 / Accepted: 15 January 2015 / Published: 23 January 2015
(This article belongs to the Special Issue Assessment of Nutrient Intakes)
View Full-Text   |   Download PDF [180 KB, uploaded 23 January 2015]

Abstract

Adult diet quality indices are shown to predict nutritional adequacy of dietary intake as well as all-cause morbidity and mortality. This study describes the reproducibility and validity of a food-based diet quality index, the Australian Recommended Food Score (ARFS). ARFS was developed to reflect alignment with the Australian Dietary Guidelines and is modelled on the US Recommended Food Score. Dietary intakes of 96 adult participants (31 male, 65 female) age 30 to 75 years were assessed in two rounds, five months apart. Diet was assessed using a 120-question semi-quantitative food frequency questionnaire (FFQ). The ARFS diet quality index was derived using a subset of 70 items from the full FFQ. Reproducibility of the ARFS between round one and round two was confirmed by the overall intraclass correlation coefficient of 0.87 (95% CI 0.83, 0.90), which compared favourably to that for the FFQ at 0.85 (95% CI 0.80, 0.89). ARFS was correlated with FFQ nutrient intakes, particularly fiber, vitamin A, beta-carotene and vitamin C (0.53, 95% CI 0.37–0.67), and with mineral intakes, particularly calcium, magnesium and potassium (0.32, 95% CI 0.23–0.40). ARFS is a suitable brief tool to evaluate diet quality in adults and reliably estimates a range of nutrient intakes. View Full-Text
Keywords: diet quality index; validation; comparative validity; reproducibility; food frequency questionnaire; intra-class correlation coefficient; dietary methods diet quality index; validation; comparative validity; reproducibility; food frequency questionnaire; intra-class correlation coefficient; dietary methods
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Collins, C.E.; Burrows, T.L.; Rollo, M.E.; Boggess, M.M.; Watson, J.F.; Guest, M.; Duncanson, K.; Pezdirc, K.; Hutchesson, M.J. The Comparative Validity and Reproducibility of a Diet Quality Index for Adults: The Australian Recommended Food Score. Nutrients 2015, 7, 785-798.

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