Epidemic investigation of thyroid diseases related to iodized salt intake in Zhoushan Archipelago

Abstract

Objective To investigate the healthy status of thyroid in the residents of Zhoushan Archipelago who hadn't taken iodized salt and to analyze the relative influeneing factors of thyroid disease. Methods Seven hundred and thirty-seven residents who hadn't eaten iodized salt in Zhoushan Archipelago were surveyed by questionnaire, their thyroid conditions were detected by B ultrasound, and their thyroid function was also determined. And at the same time, the levels of urinary iodine were analysed in those people and 183 children of 8-10 years old. Results The urinary iodine median of the residents and the children in Daishan County was 122.2,123.7 μg/L, respectively. The prevalence rates of goiter, thyroid carcinoma, hyperthyreosis, subclinical hyperthyreosis, and subclinical hyperthyroidism were 39.9% ,0.4% ,0.4% ,0.7% and 0.8%, respectively. The prevalence rate of thyroid goiter in female was the same as that in male (P > 0.05). Age was a risk factor for thyroid goiter. Thyroid goiter, hyperthyreosis and subclinical hyperthyroidism had no significant relation with dietedical conditions, smoking, drinking, tea and urinary iodine (all P > 0.05). Conclusion The residents who take non iodized salt in Daishan County have adequate iodine intake, but the prevalence rates of thyroid goiter and hyperthyreosis are higher. Key words: Iodine; Thyroid; Epidemiolagy