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Table S1. Measurement of blood donor status in the past 12 months, NHANES, 1999–2010. Table S2. Comparison of participants that were included and excluded from the analytic study population based on missing data on blood donor status and/or serum ferritin, NHANES, 1999–2010 (n = 11,379). Table S3. Association of blood donation in the past 12 months and iron deficiency among adolescent and adult females in the United States after multiple imputation using chained equations for missing data, NHANES, 1999–2010. Table S4. Association of blood donation in the past 12 months and iron deficiency among adolescent and adult females in the United States, NHANES, 1999–2002. Serum ferritin was measured by the BioRad radiometric immunoassay. Table S5. Association of blood donation in the past 12 months and iron deficiency among adolescent and adult females in the United States, NHANES, 2005–2008. Serum ferritin was measured by the Roche/Hitachi nephelometric immunoassay. Table S6. Association of blood donation in the past 12 months and iron deficiency in 16‐ to 18‐year‐old females, NHANES 1999–2010.