Missing portion sizes in FFQ - alternatives to use of standard portions

Rasmus Køster-Rasmussen, Volkert Siersma, Thorhallur I Halldorsson, Niels de Fine Olivarius, Jan E Henriksen, Berit L Heitmann

    14 Citationer (Scopus)

    Abstract

    OBJECTIVE: Standard portions or substitution of missing portion sizes with medians may generate bias when quantifying the dietary intake from FFQ. The present study compared four different methods to include portion sizes in FFQ.

    DESIGN: We evaluated three stochastic methods for imputation of portion sizes based on information about anthropometry, sex, physical activity and age. Energy intakes computed with standard portion sizes, defined as sex-specific medians (median), or with portion sizes estimated with multinomial logistic regression (MLR), 'comparable categories' (Coca) or k-nearest neighbours (KNN) were compared with a reference based on self-reported portion sizes (quantified by a photographic food atlas embedded in the FFQ).

    SETTING: The Danish Health Examination Survey 2007-2008.

    SUBJECTS: The study included 3728 adults with complete portion size data.

    RESULTS: Compared with the reference, the root-mean-square errors of the mean daily total energy intake (in kJ) computed with portion sizes estimated by the four methods were (men; women): median (1118; 1061), MLR (1060; 1051), Coca (1230; 1146), KNN (1281; 1181). The equivalent biases (mean error) were (in kJ): median (579; 469), MLR (248; 178), Coca (234; 188), KNN (-340; 218).

    CONCLUSIONS: The methods MLR and Coca provided the best agreement with the reference. The stochastic methods allowed for estimation of meaningful portion sizes by conditioning on information about physiology and they were suitable for multiple imputation. We propose to use MLR or Coca to substitute missing portion size values or when portion sizes needs to be included in FFQ without portion size data.

    OriginalsprogEngelsk
    TidsskriftPublic Health Nutrition
    Vol/bind18
    Udgave nummer11
    Sider (fra-til)1914-21
    Antal sider8
    ISSN1368-9800
    DOI
    StatusUdgivet - aug. 2015

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