Upload
signe-chaney
View
22
Download
1
Embed Size (px)
DESCRIPTION
Evaluation of the Healthy Eating Index-2005. Patricia M. Guenther, PhD, RD: US Department of Agriculture, Center for Nutrition Policy and Promotion Jill Reedy, PhD, RD: National Cancer Institute (NCI) Susan M. Krebs-Smith, PhD, RD: NCI Bryce B. Reeve, PhD: NCI. - PowerPoint PPT Presentation
Citation preview
JOURNAL OF THEAMERICAN DIETETICASSOCIATION
Guenther PM, et al. J Am Diet Assoc. 2008;108 (Nov).
JOURNAL OF THEAMERICAN DIETETICASSOCIATION
Evaluation of the Healthy Eating Index-2005
Patricia M. Guenther, PhD, RD: US Department of Agriculture, Center for Nutrition Policy and Promotion
Jill Reedy, PhD, RD: National Cancer Institute (NCI)Susan M. Krebs-Smith, PhD, RD: NCI
Bryce B. Reeve, PhD: NCI
JOURNAL OF THEAMERICAN DIETETICASSOCIATION
Guenther PM, et al. J Am Diet Assoc. 2008;108 (Nov).
• Content validity
• Construct validity
• Internal consistency (reliability)
Evaluation of the Healthy Eating Index-2005
Tests
JOURNAL OF THEAMERICAN DIETETICASSOCIATION
Guenther PM, et al. J Am Diet Assoc. 2008;108 (Nov).
• Extent to which the measure captures the variety of attributes that make up the construct
• Includes face validity
• Test– Check against Dietary Guidelines
Evaluation of the Healthy Eating Index-2005
Content validity
JOURNAL OF THEAMERICAN DIETETICASSOCIATION
Guenther PM, et al. J Am Diet Assoc. 2008;108 (Nov).
• Extent to which the measure is consistent with theoretical hypotheses
• Tests– Exemplary menus– Smokers vs nonsmokers– Correlations with energy– Principal components analysis
Evaluation of the Healthy Eating Index-2005
Construct validity
JOURNAL OF THEAMERICAN DIETETICASSOCIATION
Guenther PM, et al. J Am Diet Assoc. 2008;108 (Nov).
• MyPyramid.gov
• Dietary Approaches to Stop Hypertension (DASH) Eating Plan
• Eat, Drink, and Be Healthy: The Harvard Medical School Guide to Healthy Eating
• American Heart Association No-Fad Diet
Evaluation of the Healthy Eating Index-2005
Sources of exemplary menus
JOURNAL OF THEAMERICAN DIETETICASSOCIATION
Guenther PM, et al. J Am Diet Assoc. 2008;108 (Nov).
Evaluation of the Healthy Eating Index-2005
Healthy Eating Index-2005 scores for exemplary menusMyPyramid DASH Harvard AHA
Total Grains 5 4.8 5 5
Whole Grains 5 5 5 5
Total Vegetables 5 5 5 5
Dark Green/Orange Vegetables & Legumes
5 5 5 4.9
Total Fruit 5 5 5 5
Whole Fruit 5 5 5 5
Milk 10 10 0.9 8.7
Meat & Beans 10 10 10 10
Oils 10 10 10 10
Sodium 10 10 10 10
Saturated Fat 10 10 10 10
Calories from SoFAAS 20 20 20 20
Total 100 99.8 90.9 98.6
SoFAAS: Solid Fats, Alcoholic beverages, and Added Sugars
JOURNAL OF THEAMERICAN DIETETICASSOCIATION
Guenther PM, et al. J Am Diet Assoc. 2008;108 (Nov).
• National Health and Nutrition Examination Survey, 2001-2002
• N = 8650
• One 24-hour recall per respondent– Nutrients– MyPyramid food groups
Evaluation of the Healthy Eating Index-2005
Population data used
JOURNAL OF THEAMERICAN DIETETICASSOCIATION
Guenther PM, et al. J Am Diet Assoc. 2008;108 (Nov).
• Distinguishes between groups with known differences in the quality of their diets
• Test– Smokers vs nonsmokers
Evaluation of the Healthy Eating Index-2005
Concurrent criterion validity
JOURNAL OF THEAMERICAN DIETETICASSOCIATION
Guenther PM, et al. J Am Diet Assoc. 2008;108 (Nov).
• Number of differences in mean component scores– Original Healthy Eating Index 5 of 10– Healthy Eating Index-2005 9 of 12
• Differences in mean total score– Original Healthy Eating Index 5.5 points– Healthy Eating Index-2005 8.6 points
• Conclusion: Healthy Eating Index-2005 distinguishes between smokers and nonsmokers better than original Healthy Eating Index
Evaluation of the Healthy Eating Index-2005
Smokers vs nonsmokers
JOURNAL OF THEAMERICAN DIETETICASSOCIATION
Guenther PM, et al. J Am Diet Assoc. 2008;108 (Nov).
• Component scores – Fruit .05– Vegetables, Milk, Variety, Meat, Grains .29 to .44– Fat, Saturated fat (% calories) -.08 to .09– Cholesterol -.43– Sodium -.69
• Total score .09– Low because some food-group correlations are positive
and others negative
Evaluation of the Healthy Eating Index-2005
Correlations of original Healthy Eating Index scores and energy intake
JOURNAL OF THEAMERICAN DIETETICASSOCIATION
Guenther PM, et al. J Am Diet Assoc. 2008;108 (Nov).
• Component scores– Calories from SoFAAS -.22– Sodium, Saturated Fat -.08 to -.11– Vegetables, Grains, Fruit -.05 to -.10– Milk 0– Oils, Meat and Beans .06 to .08
• Total score -.14– Low because all component correlations are low
• Conclusion: Healthy Eating Index-2005 successfully uncouples diet quantity and diet quality
Evaluation of the Healthy Eating Index-2005
Correlations of Healthy Eating Index-2005 scores and energy intake
SoFAAS: Solid Fats, Alcoholic beverages, and Added Sugars
JOURNAL OF THEAMERICAN DIETETICASSOCIATION
Guenther PM, et al. J Am Diet Assoc. 2008;108 (Nov).
Variance accounted for by each factor
Evaluation of the Healthy Eating Index-2005
Principal component analysis scree plot
Number of factors
Eig
enva
lue
Conclusion: Multiple factors underlie the Healthy Eating Index-2005
JOURNAL OF THEAMERICAN DIETETICASSOCIATION
Guenther PM, et al. J Am Diet Assoc. 2008;108 (Nov).
• Test-retest reliability does not apply– All sources of error attributable to
• Respondent recall • Data collection and coding
• Inter-rater reliability does not apply– No judgment required
• Internal consistency– Only type that could be tested
Evaluation of the Healthy Eating Index-2005
Types of reliability
JOURNAL OF THEAMERICAN DIETETICASSOCIATION
Guenther PM, et al. J Am Diet Assoc. 2008;108 (Nov).
• Degree of association among the components of an index
• Test– Cronbach’s alpha coefficient
Evaluation of the Healthy Eating Index-2005
Internal consistency
JOURNAL OF THEAMERICAN DIETETICASSOCIATION
Guenther PM, et al. J Am Diet Assoc. 2008;108 (Nov).
• Cronbach’s coefficient alpha = 0.43
• Anticipated to be low because – Healthy Eating Index-2005 components
• Do not all measure the same thing• Relationships among them vary
• Conclusion: Healthy Eating Index-2005 is best used as a set of profile scores; otherwise, much information will be lost
Evaluation of the Healthy Eating Index-2005
Internal consistency
JOURNAL OF THEAMERICAN DIETETICASSOCIATION
Guenther PM, et al. J Am Diet Assoc. 2008;108 (Nov).
• Is a valid measure of compliance with the 2005 Dietary Guidelines for Americans
• Yields high scores for exemplary menus• Distinguishes between groups with known
differences in diet quality • Uncouples diet quality and diet quantity by using a
density approach• Provides a valid set of profile scores for assessing
diet quality
Evaluation of the Healthy Eating Index-2005
ConclusionsThe Healthy Eating Index-2005