Table 1 Clinical characteristics of the study sample (3846 individuals free of thyroid disease).

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

  Number (%) Mean ± SD Median Range
Age (years)   50.0 ± 17.1   18–93
Men 1767 (45.9)    
Premenopausal women 1081 (28.1)    
Postmenopausal women 998 (25.9)    
Currently smoking 1023 (26.6)    
BMI (kg/m2)   28.0 ± 5.1   12.2–61.3
Ferritin (µg/L)     
 <15 523 (13.6)    
 15–30 554 (14.4)    
 30–100 1473 (38.3)    
 ≥100 1296 (33.7)    
UI (μg/g)   133.8 ± 80.6 116.1 20.0–632.5
TSH (µUI/mL)   2.33 ± 1.36 2.06 0.11–18.50
FT4 (pmol/L)   15.13 ± 2.04 15.05 8.21–26.24
FT3 (pmol/L)   5.01 ± 0.72 4.95 2.59–11.95
  1. BMI: Body mass index. UI: Urinary iodine.