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O-91 - In OPEN (n=484) the FFQ under-reported energy by ~31-38% and the 24-hour recall by ~12-20%, FFQ roughly twice as biased

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observation
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O-91
statement
In the OPEN study (484 adults aged 40–69), reported energy intake versus doubly-labeled water was under-reported by ~31–36% (men) / 34–38% (women) on the FFQ and by ~12–14% (men) / 16–20% (women) on the 24-hour recall — i.e. the FFQ's energy under-reporting was roughly double that of the 24-hour recall, and larger in women.
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S-99 - The OPEN study- how much self-reported diet data actually misreports intake
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Abstract; Results, energy (doubly-labeled water)
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The direct empirical measurement-error base rate for FFQ-derived energy in the OPEN validation sample. Because egg-intake frequency in the major cohorts is FFQ-derived, this quantifies the magnitude of self-report error underlying those exposure variables. The FFQ-vs-24HR gap shows the instrument, not just the respondents, drives much of the bias.

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