Thyroid Function Tests in Elderly Finnish Men

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Abstract
Serum total thyroxine (T4), triiodothyronine (T3) and thyrotrophin (TSH) levels were determined among 65-84-year-old Finnish men living either in eastern Finland (n = 309) or in southwestern Finland (n = 389). The mean value for serum total T4 was 112.2 .+-. 23.0 nmol/l in eastern Finland and 111.3 .+-. 21.9 .+-. nmol/l in soutwestern Finland. The mean value for serum T3 was 1.76 .+-. 0.30 nmol/l in eastern Finland and 1.75 .+-. 0.46 nmol/l in southwestern Finland. Serum TSH values showed the mean for men from eastern Finland to be 3.25 .+-. 2.29 mU/l and the mean for men from southwestern Finland to be 3.11 .+-. 1.83 mU/l. No differences were found in the means of the thyroid function tests between the two areas. Serum T4 levels were not related to age. Serum T3 values fell with age. In both areas, serum TSH levels were highest among men 70-74 years of age.