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.