Roddam, Andrew W; Spencer, Elizabeth; Banks, Emily; Beral, Valerie; Reeves, Gillian K; Appleby, Paul; Barnes, Isobel; Whiteman, David C; Key, Timothy
Objectives: To assess the short- and long-term reproducibility of a short food group questionnaire, and to compare its performance for estimating nutrient intakes in comparison with a 7-day diet diary. Design: Participants for the reproducibility study completed the food group questionnaire at two time points, up to 2 years apart. Participants for the performance study completed both the food group questionnaire and a 7-day diet diary a few months apart. Reproducibility was assessed by kappa...[Show more]
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