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Abstract
<p id="d13254409e178">The authors evaluated the validity of a 152-item semiquantitative
food frequency questionnaire
(SFFQ) by comparing it with two 7-day dietary records (7DDRs) or up to 4 automated
self-administered 24-hour recalls (ASA24s) over a 1-year period in the women's Lifestyle
Validation Study (2010–2012), conducted among subgroups of the Nurses’ Health Studies.
Intakes of energy and 44 nutrients were assessed using the 3 methods among 632 US
women. Compared with the 7DDRs, SFFQ responses tended to underestimate sodium intake
but overestimate intakes of energy, macronutrients, and several nutrients in fruits
and vegetables, such as carotenoids. Spearman correlation coefficients between energy-adjusted
intakes from 7DDRs and the SFFQ completed at the end of the data-collection period
ranged from 0.36 for lauric acid to 0.77 for alcohol (mean
<i>r</i> = 0.53). Correlations of the end-period SFFQ were weaker when ASA24s were
used as
the comparison method (mean
<i>r</i> = 0.43). After adjustment for within-person variation in the comparison method,
the
correlations of the final SFFQ were similar with 7DDRs (mean
<i>r</i> = 0.63) and ASA24s (mean
<i>r</i> = 0.62). These data indicate that this SFFQ provided reasonably valid estimates
for
intakes of a wide variety of dietary variables and that use of multiple 24-hour recalls
or 7DDRs as a comparison method provided similar conclusions if day-to-day variation
was taken into account.
</p>
The Automated Self-Administered 24-hour Recall (ASA24), a freely available Web-based tool, was developed to enhance the feasibility of collecting high-quality dietary intake data from large samples.