Study

Subclinical

Overt

TSH

Comment

NHANES III

4.3%

0.3%

4.5

Colorado Thyroid Disease Prevalence

8.5%

0.4%

5.0

Abnormal thyroid function has multiple implications on public health

Framingham

10

Over age 60 years: 5.9% women; 2.3% men; 39% of whom had subnormal T₄

Whickham (UK)

10

9.3% women; 1.2% men