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Table 1 Information to be extracted for each dietary assessment method

From: Study protocol: the empirical investigation of methods to correct for measurement error in biobanks with dietary assessment

Dietary assessment method Relevant information extracted
Food frequency (FFQ) questionnaire • Number of food items
Non-weighed diet diary • Number of days covered
Weighed records • Number of days covered
24 hour recall • Single or multiple recall
• If multiple 24 hour recalls used what was the number of recalls?
• Time interval between recalls
Biochemical marker • Name of the biochemical marker?