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The number of index components affects the diagnostic accuracy of a diet quality index: the role of intracorrelation and intercorrelation structure of the components.

Abstract：

PURPOSE:The aim of this work was to evaluate whether the number of components influences the diagnostic accuracy of a diet quality index and whether this association is affected by the intercorrelation structure of components and by the association of components with an outcome (intracorrelation). METHODS:Simulated data were used to develop theoretical indices with various intracorrelation and intercorrelation structures of the components and outcomes. Moreover, dietary intake data of 668 elderly people from the MEDIS (Mediterranean Islands) study were also used to develop a diet index and to test it toward obesity status (outcome). RESULTS:On the basis of 1,000 simulations, we observed that the diagnostic accuracy of an index increases as the number of components increases, only when the components are not intercorrelated or have low intercorrelation. Moreover, the diagnostic accuracy of an index developed with all components associated with an outcome is higher compared with an index developed by using only some components related to the outcome. Finally, the predictive ability of an isolated component is lower than that of an index developed by using non-intercorrelated or low-intercorrelated components. Real data confirmed the aforementioned findings. CONCLUSION:Low-intercorrelated or non-intercorrelated components, strongly associated with a particular outcome, should be used in order to obtain an accurate composite index.

journal_name

Ann Epidemiol

journal_title

Annals of epidemiology

authors

Kourlaba G,Panagiotakos D

doi

10.1016/j.annepidem.2009.03.019

subject

Has Abstract

pub_date

2009-10-01 00:00:00

pages

692-700

issue

10

eissn

1047-2797

issn

1873-2585

pii

S1047-2797(09)00106-9

journal_volume

19

pub_type

杂志文章

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