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Stability of Within‐Person Variances of Nutrient Intake Over Time
Author(s) -
Juan WenYen,
Basiotis P. Peter,
Britten Patricia,
Guenther Patricia M
Publication year - 2007
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.21.5.a712-c
Subject(s) - nutrient , environmental health , national health and nutrition examination survey , dietary reference intake , zoology , medicine , demography , population , biology , ecology , sociology
Estimation of the proportion of a group with inadequate dietary intake relies on computation of the variance of within‐person nutrient intake. In lieu of rather large numbers of days of intake data, estimates of such variances from nationally representative surveys have been used. The objective of this study was to compare the stability of estimated within‐person variances (WPV) over time, using national food intake surveys. The WPV of intake for men and women from two national surveys (CSFII 1994–96 and NHANES 2003–04) were analyzed using PC‐SIDE software and compared to the WPV from NHANES 2001–02 published by the USDA Agriculture Research Service. Variances were calculated for 11 nutrients in 8 age‐sex groups. Among all men, WPV were relatively stable across the three surveys for fiber, vitamin B12, folate, phosphorous, and calcium. Among all women, the WPV were relatively stable for fiber, vitamins B12, E, folate, and zinc. WPV for magnesium, potassium, and vitamin C fluctuated for several age‐sex groups. WPV for iron, phosphorous, calcium, zinc, and vitamin E fluctuated for only one or two age‐sex groups. For most nutrients, the WPV were relatively stable across the three national surveys investigated; however, for some nutrients, variations in WPV were found.