Table 1 Prevalence of hypothyroidism (both overt and subclinical) in older population-based cross-sectional studies
Study [reference] | Place | Sample size | Population studied | Age range (years) | Measurement of thyroid function | Prevalence (%) Overt Subclinical Hypothyroidism |
|---|---|---|---|---|---|---|
Framingham [9] | USA | 2139 | Both sexes | >  60 | TSH & T4 | 2.5 7.9 |
Rotterdam [10] | Netherlands | 10,318 | Both sexes | ≥ 45 | TSH & FT4 | 0.8 9.1 |
Nagasaki [13] | Japan | 2550 | Atomic bomb survivors of both sexes | 58.5* | TSH & FT4 | NR 10.1 |
Cardiovascular Health Study [14] | USA | 3233 | Both sexes | >  65 | TSH & FT4 | 1.6 15.0 |
Health ABC [15] | USA | 2730 | Both sexes | 70–79 | TSH & FT4 | 0.8 12.4 |
Zoetermeer [19] | Netherlands | 403 | Men only | 73–94 | TSH, FT4, FT3, rT3 | 0.2 1.5 |
Leiden 85+ [16] | Netherlands | 558 | Both sexes | 85 | TSH & FT4 | 7 5.0 |
Birmingham [17] | England | 5960 | Both sexes | ≥ 65 | TSH & FT4 | 0.4 2.9 |
Sau Paulo Ageing and Health Study [11] | Brazil | 1373 | Both sexes | ≥ 65 | TSH, FT4 | 5.7 6.5 |
Newcastle 85+ [18] | England | 643 | Both sexes | 85 | TSH, FT4, FT3, rT3 | 0.9 12.5 |
Longitudinal Aging Study [20] | Netherlands | 1219 | Both sexes | ≥ 65 | TSH | NR 5.3 |
InChianti study [23] | Italy | 951 | Both sexes | ≥ 65 | TSH, FT4, FT3 | 0.5 3.0 |