Table 3 Prevalence (%) and adjusted Odd Ratios (OR) for presenting high TSH, low FT4 and low FT3 in the study. Individuals according to their Ferritin levels (<30 vs ≥30 µg/L).

From: Iron deficiency is associated with Hypothyroxinemia and Hypotriiodothyroninemia in the Spanish general adult population: Di@bet.es study

  Total number Number (%) Adjusted OR 95% CI p Number (%) Adjusted OR 95% CI p
    TSH ≥ 4.7 µUI/mL (p95)   TSH ≥ 5.8 µUI/mL (p97.5)  
Ferritin (µg/L) ≥30 2769 135 (4.9) 1    68 (2.5) 1   
<30 1077 57 (5.3) 0.8 (0.6–1.2) 0.348 28 (2.6) 0.9 (0.5–1.5) 0.676
    FT4 < 12.0 pmol/L (p5)   FT4 < 11.5 pmol/L (p2.5)  
Ferritin (µg/L) ≥30 2769 117 (4.2) 1    52 (1.9) 1   
<30 1075 73 (6.8) 1.5 (1.1–2.2) 0.024 41 (3.8) 1.7 (1.0–2.7) 0.044
    FT3 < 3.9 pmol/L (p5)   FT3 < 3.8 pmol/L (p2.5)  
Ferritin (µg/L) ≥30 2768 111 (4.0) 1    52 (1.9) 1   
<30 1074 76 (7.1) 1.8 (1.3–2.6) 0.001 41 (3.8) 2.0 (1.2–3.3) 0.007
  1. Adjusted ORs were calculated by logistic regression adjusted to age, sex, UI, BMI and smoking status.