Abstract
Objective: To determine the relative validity of a newly developed iron intake assessment tool, designed specifically to assess iron, calcium and vitamin C intake.
Design: Estimates of iron, calcium and vitamin C intake from a computerised iron intake assessment tool compared with those from 11-day estimated dietary records.
Setting: Region of Ghent (N=±225 000), a city in Flanders, the Dutch-speaking part of Belgium.
Subjects: In all, 50 women aged 18–39 y, participating in a large-scale epidemiological study on iron intake and iron status.
Main results: Mean dietary iron intake from the 11-day food record, the unadjusted dietary iron intake assessment tool and the adjusted tool was, respectively, 10.5±2.7, 10.4±4.3 and 9.6±2.9 mg. For the different nutrients, the correlation coefficients vary from 0.45 to 0.60 for adjusted intake. The mean difference of iron intake by the two methods (0.8±2.9 mg) did not differ significantly from zero. The new method correctly classified 38% (iron), 38% (calcium) and 58% (vitamin C) of the subjects to the correct tertile. The correlation coefficients ranged from 0.48 for adjusted vitamin C intake to 0.73 for adjusted calcium intake between two administrations.
Conclusion: The newly developed instrument can be used to assess mean group intakes of iron, calcium and vitamin C in women consuming a Western diet. However, since the ranking capability of the new tool is rather weak, further refinement of the tool is required to produce a robust method for assessing iron, calcium and vitamin C intakes of individuals.
Sponsorship: This research was supported by the Belgian National Fund for Scientific Research/Flemish Division (Fund No G.0152.01).
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Acknowledgements
We thank the dietitians Mrs M Bellemans and Mrs M De Maeyer for their important contribution to the fieldwork and the data input, Mr R Preece (Institute of Food Research, UK) and Mr B Sterken for their contribution in the software development, and Professor Dr D De Bacquer for his statistical advice. The assessment tool is available on request. This work was financially supported by the Belgian National Fund for Scientific Research/Flemish Division (Fund No G.0152.01). Iron research at the Institute of Food Research is funded by the Biotechnology and Biological Sciences Research Council and the UK Food Standards Agency.
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Guarantor: C Matthys.
Contributors: CM designed the study, analysed and interpreted the data and wrote the initial draft of the manuscript. IP assisted in collecting data and assisted in the preparation of the manuscript. MR assisted in the design of the computerised questionnaire and assisted in the preparation of the manuscript. SJF-T assisted in interpreting the data and in preparing the manuscript. A-LMH assisted in the design of the computerised questionnaire and in the preparation of the manuscript. SDH designed the study, interpreted the data and assisted in the preparation of the manuscript.
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Matthys, C., Pynaert, I., Roe, M. et al. Validity and reproducibility of a computerised tool for assessing the iron, calcium and vitamin C intake of Belgian women. Eur J Clin Nutr 58, 1297–1305 (2004). https://doi.org/10.1038/sj.ejcn.1601965
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DOI: https://doi.org/10.1038/sj.ejcn.1601965
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