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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 transferrin 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.

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 2014, the baseline data for the age group 25-44 was revised from 13.9 to 13.8 percent due to a programming error in the original estimate.


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.