Applying the triads method in the validation of dietary intake using biomarkers

Cadernos de Saúde Pública

Renata Tiene De Carvalho Yokota²  Edina Shizue Miyazaki¹  Marina Kiyomi Ito² 

[1],Universidade de Brasília Faculdade de Ciências da Saúde Brasília,Brasil

关键词: Food Consumption;    Nutrition Surveys;    Validation Studies;    Consumo de Alimentos;    Inquéritos Nutricionais;    Estudos de Validação;   

DOI  :  10.1590/S0102-311X2010001100004

来源: SciELO

【 摘 要 】

The triads method is applied in validation studies of dietary intake to evaluate the correlation between three measurements (food frequency questionnaire, reference method and biomarker) and the true intake using validity coefficients (Á). The main advantage of this technique is the inclusion of the biomarker, which presents independent errors compared with those of the traditional methods. The method assumes the linearity between the three measurements and the true intake and independence between the three measurement errors. Limitations of this technique include the occurrence of Á > 1, known as "Heywood case", and the existence of negative correlations, which do not allow the calculation of Á. The objective of this review is to present the concept of the method, describe its application and examine the validation studies of dietary intake that use the triads method. We also conceptualize the "bootstrap" method, used to estimate the confidence intervals of the validity coefficients.

【 授权许可】

CC BY   
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