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NWS-21.2 Data Details

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NWS-21.2 Reduce iron deficiency among children aged 3 to 4 years

About the Data

Description of the data source, numerator, denominator, survey questions, and other relevant details about the national estimate.

Data Source: 
National Health and Nutrition Examination Survey
Changed Since the Healthy People 2020 Launch: 
Baseline (Year): 
5.3 (2005–08)
Target-Setting Method: 
Maintain consistency with national programs, regulations, policies, and laws.
Target-Setting Method Justification: 
The target is consistent with U.S. Department of Agriculture's goal to eliminate childhood hunger. A measured level of 0.2 percent of households with very low food insecurity is within the margin of estimation and measurement of error.

Number of children aged 3 to 4 years with body iron less than zero.


Number of children aged 3 to 4 years

Comparable Healthy People 2010 Objective: 
Adapted from HP2010 objective
Data Collection Frequency: 
Methodology Notes: 

    Body iron is defined as follows: Body iron (mg/kg) = -[log10 (sTfR X1000/ferritin)-2.8229]/0.1207, where sTfr is serum transferrin receptor in milligrams per liter and ferritin is serum ferritin in micrograms per liter.

Changes Between HP2010 and HP2020: 
This objective differs from Healthy People 2010 objective 19-12a in that the model used to determine iron deficiency was changed from the ferritin model to the body iron stores model.

Revision History

Any change to the objective text, baseline, target, target-setting method or data source since the Healthy People 2020 launch.

Description of Changes Since the Healthy People 2020 Launch: 
In 2013, the baseline data for the race/ethnicity group Black or African American only, not Hispanic or Latino was revised due to a programming error in the original estimate from 10.2 percent (SE 2.717) to a new estimate which is now suppressed because it is statistically unreliable.


Additional resources about the objective

  1. Cook JD, Flowers CH, Skikne BS. The qualitative assessment of body iron. Blood 2003; 101:3359-34.
  2. Skikne BS, Flowers CH, Cook JD. Serum transferrin receptor: a qualitative measure of tissue iron deficiency. Blood 1990; 75:1870-1876.