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A dietary supplement use questionnaire has acceptable reproducibility across one year: Results from the SURE Study
Author(s) -
Morimoto Yukiko,
Wilkens Lynne,
Monroe Kristine,
Yonemori Kim,
Steffen Alana,
Shen Lucy,
Murphy Suzanne
Publication year - 2008
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.22.1_supplement.868.11
Subject(s) - medicine , dietary supplement , kappa , vitamin d and neurology , vitamin , food frequency questionnaire , cohort , epidemiology , environmental health , gerontology , food science , biology , mathematics , geometry
Validated methods to collect data on dietary supplement use are increasingly needed in nutritional epidemiology studies. The Supplement Reporting (SURE) Study evaluated the most common methods of collecting dietary supplement use data among five racial/ethnic populations participating in the Multiethnic Cohort Study in Hawaii and Los Angeles. A self‐administered, one‐year supplement frequency questionnaire (SFQ) was completed at baseline and one year later, and compared for differences in responses. The SFQ asked about different types of multiple vitamin and mineral (MVM) preparations, 11 common single‐nutrient supplements, as well as garlic and fish oil. Only 11% of MVM users at baseline did not report use after one year, while 18% (calcium) to 58 % (vitamin A) of users of single nutrient supplements did not report use one year later. Simple Kappa coefficients (evaluating use/non‐use) ranged from 0.41 for antioxidant MVM to 0.71 for garlic supplements. Weighted Kappa coefficients (evaluating frequency of use) ranged from 0.34 for antioxidant MVM to 0.62 for B‐complex MVM. Most Kappa values were above 0.4, indicating moderate to good agreement between the two SFQs. The one‐year SFQ provides a reproducible tool in evaluating the use of selected dietary supplements among multiethnic populations. Future analyses will examine the validity of the SFQ. Supported by NCI, grant # R01 CA106744.