Table 2 Estimated mean concentrations of TSH, FT4, and FT3 in the study individuals divided according to their Ferritin levels.

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

  Ferritin (µg/L) P for difference P for trend
<15 15–30 30–100 >100
TSH (µUI/mL) 1.98 ± 0.07 2.07 ± 0.06 2.02 ± 0.04 2.05 ± 0.04 0.565 0.451
FT4 (pmol/L) 14.83 ± 0.10 15.06 ± 0.09 15.09 ± 0.06 15.33 ± 0.07 <0.001 <0.001
FT3 (pmol/L) 4.91 ± 0.03 4.91 ± 0.03 5.01 ± 0.02 5.11 ± 0.02 <0.001 <0.001
  1. Data are estimated marginal means ± standard errors calculated in a general linear model, adjusted to age, sex, UI, BMI and smoking status.