TABLE J-6NHANES Survey Years Applied for Each Analytical Subgroup

SubgroupSurvey Years AnalyzedRationale
Women2005–2012Survey years were combined to increase sample size and allow for separation by physiological state; no postpartum variable is available in NHANES 2005–2006, so for these women, the data span NHANES 2007–2012
Formula-fed infants2005–2008; 2011–2012Sample size allows for examination of pre- and post-2009 food package changes
Breastfed infants2009–2012*Survey years were combined to increase sample size; the starting year of 2009 was chosen because sometime during this year, states issued jarred infant food meats
Children2005–2008; 2011–2012Sample size allows for examination of pre- and post-2009 food package changes

NOTES: NHANES = National Health and Nutrition Examination Survey.

*

This group includes some WIC participants receiving the pre-2009 food package because the committee was unable to divide the 2009–2010 NHANES survey dataset. As a result, the 2009–2010 NHANES release was included in the post-2009 food package change analysis to ensure adequacy of sample sizes.

From: Appendix J, Nutrient and Food Intake of WIC Subgroups: Analytical Methods and Results

Cover of Review of WIC Food Packages
Review of WIC Food Packages: Improving Balance and Choice: Final Report.
National Academies of Sciences, Engineering, and Medicine; Health and Medicine Division; Food and Nutrition Board; Committee to Review WIC Food Packages.
Washington (DC): National Academies Press (US); 2017 May 1.
Copyright 2017 by the National Academy of Sciences. All rights reserved.

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