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FUENTES Y MAGNITUD DE LA VARIACIóN EN LA DIETA DE ADULTOS DE BUCARAMANGA, COLOMBIA

DOI: 10.4067/S0717-75182006000100006

Keywords: diet, anova, coefficient of variation, sample size.

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Abstract:

the incorrect measurement of the diet produces an attenuation or dilution of epidemiologic measures. the variation within-person and between-person are the main determinant of this effect. to describe the variability of the diet of a colombian city, the record of the dietary intake survey of 167 adults carried out during seven days and in different seasons, during 1998-2003, was analyzed. using analysis of variance (anova), error within-person and between-person, was calculated the reason within-person/between-person, and the variation coefficients for the absolute values, transformed and adjusted by the energy using lineal regression. the reason within-person/between-person is not different for sex and smaller than 1 for all the nutritional variables, except for dietary fiber, iron and manganese. the error between-person was explained by the subjects, sex and the day of the week. with an error margin between 10% and 15%, it is viable in this population to study the diet correctly. the drop variability within-person will attenuate little the measures of absolute effect calculated in epidemic studies. however, the diet is homogeneous and characteristic of a poor country, what will hinder to find relationships between diet and illness

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