Table 1

Characteristics of adults aged 18 years and older with and without iron deficiency, NHANES 1999–2006

WomenMen
Iron deficiencyNo iron deficiencyP*Iron deficiencyNo iron deficiencyP*
Sample size1,150 (13.7)5,516 (86.3)75 (1.6)3,794 (98.4)<0.001
Age
    <50 years88.769.4<0.00163.771.20.216
    ≥50 years11.330.636.328.9
Race/ethnicity (%)
    Non-Hispanic white56.772.4<0.00175.071.80.876
    African American18.210.99.89.7
    Hispanic20.712.311.515.0
    Other4.44.43.73.6
BMI (%)
    <25 kg/m235.744.1<0.00128.036.40.225
    25 to <30 kg/m224.126.635.240.4
    ≥30 kg/m240.329.336.823.3
Waist circumference (cm)94.2 ± 0.891.1 ± 0.4<0.001107.8 ± 3.397.0 ± 0.30.002
Parity (women only) (%)
    024.327.30.157
    115.916.5
    225.627.3
    318.717.3
    49.16.3
    ≥5 births6.45.3
Hysterectomy (women only) (%)5.617.6<0.001
Anemia (%)29.52.3<0.00133.33.3<0.001
A1C (%)5.31 ± 0.025.27 ± 0.010.1275.43 ± 0.065.29 ± 0.020.035
A1C (%)
    <5.473.676.50.36654.773.9<0.001
    5.5–6.023.920.537.922.5
    6.1–6.41.51.77.32.0
    6.5–6.90.40.60.00.6
    7.0–7.90.30.30.00.4
    8.0–8.90.20.10.10.2
    ≥9.00.30.30.00.4
Fasting glucose (mg/dl) (n = 2,993 women, n = 1,799 men)92.4 ± 0.894.2 ± 0.50.034101.5 ± 2.398.8 ± 0.60.269
Fasting glucose <126 mg/dl (n = 2,993 women, n = 1,799 men) (%)99.298.50.096100.097.3<0.001
  • Data are n (%), weighted percentage, or means ± SE adjusted for complex survey design. Percentages may not total 100 because of rounding, and percentages may differ from unweighted calculations of percentages.

  • *P value was determined by a design-corrected χ2 test or t test.