PREVALENCE OF IRON-DEFICIENCY IN THE UNITED-STATES

Objective.-To determine the prevalence of iron deficiency and iron def iciency anemia in the US population. Design.-Nationally representative cross-sectional health examination survey that included venous blood measurements of iron status. Main Outcome Measures.-Iron deficiency, d efined as having an abnormal value for at least 2 of 3 laboratory test s of iron status (erythrocyte protoporphyrin, transferrin saturation, or serum ferritin); and iron deficiency anemia, defined as iron defici ency plus low hemoglobin. Participants.-A total of 24 894 persons aged 1 year and older examined in the third National Health and Nutrition Examination Survey (1988-1994). Results.-Nine percent of toddlers aged 1 to 2 years and 9% to 11% of adolescent girls and women of childbear ing age were iron deficient; of these, iron deficiency anemia was foun d in 3% and 2% to 5%, respectively. These prevalences correspond to ap proximately 700 000 toddlers and 7.8 million women with iron deficienc y; of these, approximately 240 000 toddlers and 3.3 million women have iron deficiency anemia. Iron deficiency occurred in no more than 7% o f older children or those older than 50 years, and in no more than 1% of teenage boys and young men. Among women of childbearing age, iron d eficiency was more likely in those who are minority, low income, and m ultiparous. Conclusion.-Iron deficiency and iron deficiency anemia are still relatively common in toddlers, adolescent girls, and women of c hildbearing age.