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The difficulties in estimating the intake of salt per se may account for divergent findings.
As the required sample size was largest for estimating the intake of fruit, the power and sample size calculations are based on its results in P1.
A micronutrient score was calculated from the 30-item food frequency questionnaire developed for South Africa by estimating the intake of 13 nutrients (10).
Owing to the difficulties in estimating the intake of salt per se, its validity is expected to be lower within each study area with limited variation when compared with that in four areas combined.
This method has been shown to be appropriate for estimating the intake of foods that are not eaten daily (such as seafood) (Emmett 2009), and the method has been demonstrated to provide adequate assessments of trace metal intake when compared with the duplicate diet method (Liu et al. 2010).
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Previous studies have not used a quantitative database to estimate the intake of these compounds in a US population.
The aim of this study was to assess the reproducibility and relative validity of a food frequency questionnaire (FFQ) designed to estimate the intake of dioxin-like contaminants.
These studies used food frequency questionnaires to estimate the intake of fruits and vegetables.
We estimated the intake of minerals and vitamins from supplements by subtracting dietary intake from total nutrient intake.
It is then possible to estimate the intake of each individual in the survey to derive population statistics.
We will also estimate the intake of specific food groups including fruit, vegetable, nuts, fish and pulses.
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