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Comparison of NHANES 2007‐2010 methodologies for assessing dietary supplement use, part II (245.3)
Author(s) -
Nicastro Holly,
Dodd Kevin
Publication year - 2014
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.28.1_supplement.245.3
Subject(s) - medicine , zoology , food frequency questionnaire , population , nutrient , limits of agreement , mathematics , food intake , statistics , environmental health , nuclear medicine , chemistry , biology , organic chemistry
In NHANES 2007‐2010 dietary supplement (DS) intake, traditionally measured using a DS questionnaire (DSQ) that assessed usage over the past 30 days, was also measured by up to two 24‐hour dietary recalls (24HR). Estimating total nutrient intake requires combining intake from food sources (on 24HRs) with DS intake. This study describes differences between distributions of total nutrient intake estimated 1) using raw DSQ values and 2) using DSQ values calibrated to the relative frequency on the 24HR. Calibration had little effect on means but significant effects on population percentages with intake above the upper limit (UL) or below the estimated average requirement (EAR). Differences were more pronounced among DS users than non‐users or the overall population. Among females aged 51‐70 who reported using calcium supplements, mean total calcium intake was 1566±27 (estimate±s.e.) before/ 1518±26 mg after calibration (p<0.001). An estimated 8±1% (raw) vs. 7±1% (calibrated) had intake below the EAR (p=0.046), and 23±1% (raw) vs. 18±2% (calibrated) had intake above the UL (p<0.001). These differences were enough to affect the overall distribution as well, suggesting that using the DSQ probability as truth may erroneously extend both the left and right tails of the estimated total nutrient distribution. Combining information from DSQ and 24HR with this method may improve the estimation of total intake distributions.