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Evaluation of a simplified vitamin supplement inventory developed for the Women's Health Initiative

Published online by Cambridge University Press:  02 January 2007

Ruth E Patterson ,
Lisa Levy ,
Lesley Fels Tinker  and
Alan R Kristal
Ruth E Patterson*
Affiliation:
Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue North, Seattle, WA 98109, USA
Lisa Levy
Affiliation:
Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue North, Seattle, WA 98109, USA
Lesley Fels Tinker
Affiliation:
Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue North, Seattle, WA 98109, USA
Alan R Kristal
Affiliation:
Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue North, Seattle, WA 98109, USA
*
*Corresponding author: Email [email protected]
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Abstract

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Objective

To evaluate the accuracy of a simplified inventory procedure for assessing nutrient intake from vitamin and mineral supplements.

Design

Participants brought their supplements to a clinic. An interviewer conducted the supplement inventory procedure, which consisted of recording data on the type of multiple vitamin and single supplements used. For the multiple vitamins, the interviewer recorded the exact dose for a subset of nutrients (vitamin C, calcium, selenium). For other nutrients, we imputed the dose in multiple vitamins. The dose of all single supplements was recorded. Labels of the supplements were photocopied and we transcribed the exact nutrient label data for the criterion measure. Spearman correlation coefficients were used to assess precision of nutrient intakes from the simplified inventory compared to the criterion measure.

Setting/subjects

Data are from 104 adult vitamin supplement users in Washington state.

Results

Correlation coefficients between nutrient intake estimated from the simplified inventory compared to the criterion measure were high (0.8–1.0) for those nutrients (vitamin C, calcium, selenium) for which the interviewer recorded the exact dose contained in multiple vitamins. However, for nutrients for which imputations were made regarding dose in multiple vitamins, correlation coefficients ranged from good (0.8 for vitamin E) to poor (0.3 for iron).

Conclusions

The simplified inventory is rapid (4–5 min) and practical for large-scale studies. The precision of nutrient estimates using this procedure was variable, although excellent for the subset of nutrients for which the dose was recorded exactly. This study illustrates many of the challenges of collecting high quality supplement data.

Keywords

Epidemiological methodsNutrition assessmentQuestionnairesVitamins
Type
Research Article
Information
Public Health Nutrition , Volume 2 , Issue 3 , March 1999 , pp. 273 - 276
Copyright
Copyright © CABI Publishing 1999

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