Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 508784
Title Evaluation of a two-part regression calibration to adjust for dietary exposure measurement error in the Cox proportional hazards model : A simulation study
Author(s) Agogo, George O.; Voet, Hilko van der; Veer, Pieter van 't; Eeuwijk, Fred A. van; Boshuizen, Hendriek C.
Source Biometrical Journal 58 (2016)4. - ISSN 0323-3847 - p. 766 - 782.
Department(s) Biometris (WU MAT)
Biometris (PPO/PRI)
Chair Sensory Science and Eating Behaviour
Human Nutrition (HNE)
Publication type Refereed Article in a scientific journal
Publication year 2016
Keyword(s) Attenuation - Episodically consumed foods - Measurement error - Reference measurements - Regression calibration

Dietary questionnaires are prone to measurement error, which bias the perceived association between dietary intake and risk of disease. Short-term measurements are required to adjust for the bias in the association. For foods that are not consumed daily, the short-term measurements are often characterized by excess zeroes. Via a simulation study, the performance of a two-part calibration model that was developed for a single-replicate study design was assessed by mimicking leafy vegetable intake reports from the multicenter European Prospective Investigation into Cancer and Nutrition (EPIC) study. In part I of the fitted two-part calibration model, a logistic distribution was assumed; in part II, a gamma distribution was assumed. The model was assessed with respect to the magnitude of the correlation between the consumption probability and the consumed amount (hereafter, cross-part correlation), the number and form of covariates in the calibration model, the percentage of zero response values, and the magnitude of the measurement error in the dietary intake. From the simulation study results, transforming the dietary variable in the regression calibration to an appropriate scale was found to be the most important factor for the model performance. Reducing the number of covariates in the model could be beneficial, but was not critical in large-sample studies. The performance was remarkably robust when fitting a one-part rather than a two-part model. The model performance was minimally affected by the cross-part correlation.

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