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NWS-21.3 Data Details

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NWS-21.3 Reduce iron deficiency among females aged 12 to 49 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: 
Yes
Measure: 
percent
Baseline (Year): 
10.5 (2005–08)
Target: 
9.4
Target-Setting Method: 
10 percent improvement
Numerator: 

Number of women aged 12 to 49 years with body iron less than zero.

Denominator: 

Number of women aged 12 to 49 years

Comparable Healthy People 2010 Objective: 
Adapted from HP2010 objective
Data Collection Frequency: 
Periodic
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 was revised from 10.4 to 10.5 percent due to a programming error in the original estimate. The target remained the same.

References

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.