Validity of dietary patterns derived in nutrition surveys using a priori and a posteriori multivariate statistical methods

Aim: To evaluate the validity of dietary patterns derived using both a priori and a posteriori methods.  Method: Five hundred individuals (46 ± 16 years, 40% males) completed a valid 76-food item food frequency questionnaire and a 3-day dairy. The MedDietScore was used to a priori assess the adheren...

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Published in:International journal of food sciences and nutrition 2011-09, Vol.62 (6), p.617-627
Main Authors: Bountziouka, Vassiliki, Tzavelas, George, Polychronopoulos, Evangelos, Constantinidis, Theodore C., Panagiotakos, Demosthenes B.
Format: Article
Language:English
Subjects:
a posteriori
a priori
Adult
Cluster Analysis
Diet
Diet Records
Diet, Mediterranean
dietary patterns
Feeding Behavior
Female
food frequency questionnaire
Food science
Humans
Male
Middle Aged
Multivariate Analysis
Nutrition
Nutrition Surveys - methods
Principal Component Analysis
Reproducibility of Results
Surveys and Questionnaires
Validity
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Summary:Aim: To evaluate the validity of dietary patterns derived using both a priori and a posteriori methods.  Method: Five hundred individuals (46 ± 16 years, 40% males) completed a valid 76-food item food frequency questionnaire and a 3-day dairy. The MedDietScore was used to a priori assess the adherence to the Mediterranean diet, while principal components and cluster analysis were used as the a posteriori methods.  Results: Both the a priori and a posteriori methods used led to relatively low-validity dietary patterns. However, the level of validity reached significance in many cases and, also, varied by the type of validation method used (i.e. Bland and Altman, non-parametric criteria, etc.).  Conclusion: The aforementioned findings may suggest that the use of both a priori and a posteriori pattern analysis in nutrition surveys should be made with conscious thought and further research is needed in order to establish robust methodologies to assess the validity of patterns.
ISSN:0963-7486
1465-3478
DOI:10.3109/09637486.2011.561783