We also performed an association study with the IL-23 gene polymorphism rs11171806 in both cohorts, in Shanghai cohorts, the frequencies of rs11171806 alleles were strongly different between Graves' disease patients (G 95.7% and A 4.3%) and healthy controls (G 97.7% and A 2.3%) (P=2.6×10(-3), OR=1.93 (95% CI: 1.25-2.97)), and in Xiamen cohorts, the proportion of individuals carrying the A allele of rs11171806 was the same significantly higher in Graves' disease patients than in controls [Graves' disease vs. control, 4.8% vs. 4.3%, OR=2.15 (95% CI: 1.23-3.79), P(allele)=6.3×10(-3)].