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NWS-22 Data Details

NWS-22 Reduce iron deficiency among pregnant females

About the Data

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

National Data Source
National Health and Nutrition Examination Survey (NHANES); Centers for Disease Control and Prevention, National Center for Health Statistics (CDC/NCHS)
Changed Since the Healthy People 2020 Launch
Baseline (Year)
16.1 (2003-2006)
Target-Setting Method
10 percent improvement

Number of pregnant women with body iron less than zero.

Number of pregnant women
Data Collection Frequency
Comparable Healthy People 2010 Objective
Retained from HP2010 objective
Methodology Notes

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

Caveats and Limitations
Iron deficiency status varies by trimester. Future analyses of overall prevalence of iron deficiency will need to standardize to the trimester distribution in 2003-2006 NHANES.


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 transferring receptor: a qualitative measure of tissue iron deficiency. Blood 1990; 75:1870-1876.