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  1. The diuretic effects of alcohol and caffeine and total water intake misclassification.

    Article - En anglais

    Data from the 1994 USDA nationwide survey (CSFII) on 190 non-smoking males (aged 20 29) were used to propose a method for adjusting total water intake for the diuretic effects of caffeine and alcohol, and evaluate the potential for related misclassification bias.

    The data were processed on a per meal basis.

    Under the assumption that subjects were in water balance at the start of the survey day, water losses due to caffeine (1.17 ml/mg caffeine) and alcohol (10 ml/g alcohol) were subtracted from crude intake estimates.

    If water intake for one meal was inadequate for excretion of the associated osmotic load at 750 mosmol/l, water losses for the subsequent meal were reduced by 32%. Unadjusted and adjusted mean total water intakes differed by 321.5 g. Misclassification appeared worst at higher water intakes.

    Linear regression models, each with a water intake variable as an independent variable and body mass index as the outcome, were fit to evaluate the potential for alcohol-and caffeine-related misclassification bias.

    Misclassification resulted in large changes (all>10%) in linear regression estimates of effect.

    Future studies of water-disease relationships, especially those intending to compare extremes of total water intake, should consider caffeine-and alcohol-related misclassification bias.

    Mots-clés Pascal : Etats Unis, Amérique du Nord, Amérique, Homme, Evaluation, Consommation alimentaire, Boisson alcoolisée, Caféine, Diurèse, Bilan eau, Besoin hydrique, Méthodologie, Erreur estimation

    Mots-clés Pascal anglais : United States, North America, America, Human, Evaluation, Food intake, Alcoholic beverage, Caffeine, Diuresis, Water balance, Water requirement, Methodology, Estimation error

    Logo du centre Notice produite par :
    Inist-CNRS - Institut de l'Information Scientifique et Technique

    Cote : 99-0190744

    Code Inist : 002B30A01A1. Création : 16/11/1999.