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Allowing for variations in multivitamin supplement composition improves nutrient intake estimates for epidemiologic
Song-Yi Park1, Suzanne P Murphy, Lynne R Wilkens
1Cancer Epidemiology Program, Cancer Research Center of Hawaii, University of Hawaii, Honolulu, Hawaii 96813, USA. spark@crch.hawaii.edu
The Journal of Nutrition
|April 15, 2006
Summary
Estimating nutrient intake from multivitamins is challenging. Using four default profiles for multivitamin supplements significantly improves accuracy compared to a single default, aiding dietary assessment.
Area of Science:
- Nutrition Science
- Dietary Assessment Methodology
Background:
- Detailed dietary supplement data collection is burdensome.
- Multivitamin formulations vary widely, complicating intake estimation.
- Current methods often use default nutrient values, questioning accuracy.
Purpose of the Study:
- To evaluate the impact of different default multivitamin compositions on nutrient intake estimation accuracy.
- To compare a single default value approach with a multi-profile default approach.
Main Methods:
- Calculated nutrient intakes from detailed multivitamin use data (n=26,735).
- Recalculated intakes using a single default composition and four subtype-specific default compositions.
- Analyzed accuracy using Spearman correlation coefficients between estimated and actual nutrient intakes.
Main Results:
- Nutrient composition varied widely across 1246 reported multivitamin brands.
- Four default profiles yielded correlations >0.5 for 12 of 15 nutrients.
- A single default profile resulted in correlations >0.5 for only 5 nutrients.
Conclusions:
- A four-profile default approach substantially enhances nutrient intake estimation accuracy over a single default.
- This improved accuracy is crucial for reliable dietary assessment in studies involving multivitamin use.