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No significant difference of diffuse goiter prevalence was observed in both groups (19.7% vs 22.0%; p = 0.482). On the other hand, the prevalence of nodules was significantly higher in group 1 (16.3% vs 8.3%; p = 0.003). However Logistic regression analysis adjusted by age and sex showed that age and female gender were correlated with goiter and nodule prevalence.
