Journal
NUTRITION RESEARCH
Volume 35, Issue 3, Pages 265-268Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.nutres.2014.12.011
Keywords
Validation; A posteriori dietary patterns; Repeatability; Cluster analysis; Food frequency questionnaire; Reproducibility
Categories
Funding
- Fondo Europeo de Desarrollo Regional [2FD097-0297-CO2-01]
- FPU, of Spain's Ministry of Education [AP2010-3198]
- Spain's Ministerio de Sanidad y Consumo, Instituto de Salud Carlos III Fondo Europeo de Desarrollo Regional [PI11/01900]
- Red HERACLES [RD06/0009]
- Institut de Salud Carlos III [CES09/030]
- Health Department of the Catalan Government (Generalitat de Catalunya) [CES09/030]
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Cluster analysis is widely used to analyze dietary patterns. We aimed to analyze the validity and reproducibility of the dietary patterns defined by cluster analysis derived from a food frequency questionnaire (FFQ). We hypothesized that the dietary patterns derived by cluster analysis have fair to modest reproducibility and validity. Dietary data were collected from 107 individuals from population-based survey, by an FFQ at baseline (FFQ1) and after 1 year (FFQ2), and by twelve 24-hour dietary recalls (24-HDR). Repeatability and validity were measured by comparing clusters obtained by the FFQ1 and FFQ2 and by the FFQ2 and 24-HDR (reference method), respectively. Cluster analysis identified a fruits & vegetables and a meat pattern in each dietary data source. Cluster membership was concordant for 66.7% of participants in FFQ1 and FFQ2 (reproducibility), and for 67.0% in FFQ2 and 24-HDR (validity). Spearman correlation analysis showed reasonable reproducibility, especially in the fruits & vegetables pattern, and lower validity also especially in the fruits & vegetables pattern. kappa statistic revealed a fair validity and reproducibility of clusters. Our findings indicate a reasonable reproducibility and fair to modest validity of dietary patterns derived by cluster analysis. (C) 2015 Elsevier Inc. All rights reserved.
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