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Table 1 Prevalence of hypothyroidism (both overt and subclinical) in older population-based cross-sectional studies

From: Hypothyroidism in the older population

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
  1. *Mean age provided as minimum age not available