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THE CHANGING AGE INCIDENCE OF JODBASEDOW IN TASMANIA

Jodbasedow, as defined by Kocher (1910), described iodine‐induced thyrotoxicosis affecting elderly goitrous people who lived in areas which were iodine deficient. The correction of chronic iodine deficiency in Tasmania in 1966 produced an increased incidence of thyrotoxicosis, but the age groups affected appear to be different to those described by Kocher. There was an increase in the incidence of thyrotoxicosis in middle‐aged and elderly goitrous people, particularly in the first two or three years after iodation of bread, but this has been followed by a falling incidence. In contrast, there was a similar peak in the incidence of thyrotoxicosis in the younger age group which has been maintained or is rising gradually. Both increases far exceed that expected by population growth, and their sum, representing the total incidence, may remain at a steady state indefinitely.