Parameters

Ferritin < reference range

Ferritin within the reference range

Ferritin > reference range

p

n

582

13962

2232

Age

45.5 ± 13.4

47.4 ± 15.8

54.3 ± 13.9

<0.0001

Free triiodothyronine (FT3) 2.3 - 4.1 pg/mL

3.1 ± 0.6

3.1 ± 0.6

3.1 ± 0.6

0.4652

Free thyroxine (FT4) 0.9 - 1.7 ng/dL

1.2 ± 0.3

1.2 ± 0.22

1.2 ± 0.23

<0.0001

Thyroxine (T4) 0.40 - 4.50 mIU/mL

6.9 ± 1.5

7.05 ± 1.4

7.2 ± 1.5

<0.0001

Triiodothyronine (T3) 100 - 200 ng/dL

1.1 ± 0.2

1.1 ± 0.2

1.1 ± 0.2

0.0320

Thyroid-stimulating hormone (TSH) 0.3 - 4.2 mlU/L

2.6 ± 4.7

2.3 ± 2.8

2.4 ± 4.8

0.0120

Antithyroid peroxidase (anti-TPO) < 9.0 IU/mL

40.3 ± 136.2

31.9 ± 88.9

36.4 ± 118.3

0.2794

Reverse T3 (RT3) 9.2 - 24.1 ng/dL

13.18 ± 4.3

13.6 ± 6.7

14.4 ± 7.1

<0.0001